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ListBox Class

Represents a Windows control to display a list of items.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

'Declaration
<ComVisibleAttribute(True)> _
<DefaultBindingPropertyAttribute("SelectedValue")> _
<ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)> _
Public Class ListBox _
	Inherits ListControl

The ListBox type exposes the following members.

  NameDescription
Public methodListBoxInitializes a new instance of the ListBox class.
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  NameDescription
Public propertyAccessibilityObjectGets the AccessibleObject assigned to the control. (Inherited from Control.)
Public propertyAccessibleDefaultActionDescriptionGets or sets the default action description of the control for use by accessibility client applications. (Inherited from Control.)
Public propertyAccessibleDescriptionGets or sets the description of the control used by accessibility client applications. (Inherited from Control.)
Public propertyAccessibleNameGets or sets the name of the control used by accessibility client applications. (Inherited from Control.)
Public propertyAccessibleRoleGets or sets the accessible role of the control (Inherited from Control.)
Public propertyAllowDropGets or sets a value indicating whether the control can accept data that the user drags onto it. (Inherited from Control.)
Protected propertyAllowSelectionGets a value indicating whether the ListBox currently enables selection of list items. (Overrides ListControl.AllowSelection.)
Public propertyAnchorGets or sets the edges of the container to which a control is bound and determines how a control is resized with its parent. (Inherited from Control.)
Public propertyAutoScrollOffsetGets or sets where this control is scrolled to in ScrollControlIntoView. (Inherited from Control.)
Public propertyAutoSizeInfrastructure. This property is not relevant for this class. (Inherited from Control.)
Public propertyBackColorGets or sets the background color for the control. (Overrides Control.BackColor.)
Public propertyBackgroundImageInfrastructure. This property is not relevant to this class. (Overrides Control.BackgroundImage.)
Public propertyBackgroundImageLayoutInfrastructure. Gets or sets the background image layout for a ListBox as defined in the ImageLayout enumeration. (Overrides Control.BackgroundImageLayout.)
Public propertyBindingContextGets or sets the BindingContext for the control. (Inherited from Control.)
Public propertyBorderStyleGets or sets the type of border that is drawn around the ListBox.
Public propertyBottomGets the distance, in pixels, between the bottom edge of the control and the top edge of its container's client area. (Inherited from Control.)
Public propertyBoundsGets or sets the size and location of the control including its nonclient elements, in pixels, relative to the parent control. (Inherited from Control.)
Protected propertyCanEnableImeGets a value indicating whether the ImeMode property can be set to an active value, to enable IME support. (Inherited from Control.)
Public propertyCanFocusGets a value indicating whether the control can receive focus. (Inherited from Control.)
Protected propertyCanRaiseEventsDetermines if events can be raised on the control. (Inherited from Control.)
Public propertyCanSelectGets a value indicating whether the control can be selected. (Inherited from Control.)
Public propertyCaptureGets or sets a value indicating whether the control has captured the mouse. (Inherited from Control.)
Public propertyCausesValidationGets or sets a value indicating whether the control causes validation to be performed on any controls that require validation when it receives focus. (Inherited from Control.)
Public propertyClientRectangleGets the rectangle that represents the client area of the control. (Inherited from Control.)
Public propertyClientSizeGets or sets the height and width of the client area of the control. (Inherited from Control.)
Public propertyColumnWidthGets or sets the width of columns in a multicolumn ListBox.
Public propertyCompanyNameGets the name of the company or creator of the application containing the control. (Inherited from Control.)
Public propertyContainerGets the IContainer that contains the Component. (Inherited from Component.)
Public propertyContainsFocusGets a value indicating whether the control, or one of its child controls, currently has the input focus. (Inherited from Control.)
Public propertyContextMenuGets or sets the shortcut menu associated with the control. (Inherited from Control.)
Public propertyContextMenuStripGets or sets the ContextMenuStrip associated with this control. (Inherited from Control.)
Public propertyControlsGets the collection of controls contained within the control. (Inherited from Control.)
Public propertyCreatedGets a value indicating whether the control has been created. (Inherited from Control.)
Protected propertyCreateParamsGets the required creation parameters when the control handle is created. (Overrides Control.CreateParams.)
Public propertyCursorGets or sets the cursor that is displayed when the mouse pointer is over the control. (Inherited from Control.)
Public propertyCustomTabOffsetsGets the width of the tabs between the items in the ListBox.
Public propertyDataBindingsGets the data bindings for the control. (Inherited from Control.)
Protected propertyDataManagerGets the CurrencyManager associated with this control. (Inherited from ListControl.)
Public propertyDataSourceGets or sets the data source for this ListControl. (Inherited from ListControl.)
Protected propertyDefaultCursorGets or sets the default cursor for the control. (Inherited from Control.)
Protected propertyDefaultImeModeGets the default Input Method Editor (IME) mode supported by the control. (Inherited from Control.)
Protected propertyDefaultMarginGets the space, in pixels, that is specified by default between controls. (Inherited from Control.)
Protected propertyDefaultMaximumSizeGets the length and height, in pixels, that is specified as the default maximum size of a control. (Inherited from Control.)
Protected propertyDefaultMinimumSizeGets the length and height, in pixels, that is specified as the default minimum size of a control. (Inherited from Control.)
Protected propertyDefaultPaddingGets the internal spacing, in pixels, of the contents of a control. (Inherited from Control.)
Protected propertyDefaultSizeGets the default size of the control. (Overrides Control.DefaultSize.)
Protected propertyDesignModeGets a value that indicates whether the Component is currently in design mode. (Inherited from Component.)
Public propertyDisplayMemberGets or sets the property to display for this ListControl. (Inherited from ListControl.)
Public propertyDisplayRectangleGets the rectangle that represents the display area of the control. (Inherited from Control.)
Public propertyDisposingGets a value indicating whether the base Control class is in the process of disposing. (Inherited from Control.)
Public propertyDockGets or sets which control borders are docked to its parent control and determines how a control is resized with its parent. (Inherited from Control.)
Protected propertyDoubleBufferedGets or sets a value indicating whether this control should redraw its surface using a secondary buffer to reduce or prevent flicker. (Inherited from Control.)
Public propertyDrawModeGets or sets the drawing mode for the control.
Public propertyEnabledGets or sets a value indicating whether the control can respond to user interaction. (Inherited from Control.)
Protected propertyEventsGets the list of event handlers that are attached to this Component. (Inherited from Component.)
Public propertyFocusedGets a value indicating whether the control has input focus. (Inherited from Control.)
Public propertyFontGets or sets the font of the text displayed by the control. (Overrides Control.Font.)
Protected propertyFontHeightGets or sets the height of the font of the control. (Inherited from Control.)
Public propertyForeColorGets or sets the foreground color of the control. (Overrides Control.ForeColor.)
Public propertyFormatInfoGets or sets the IFormatProvider that provides custom formatting behavior. (Inherited from ListControl.)
Public propertyFormatStringGets or sets the format-specifier characters that indicate how a value is to be displayed. (Inherited from ListControl.)
Public propertyFormattingEnabledGets or sets a value indicating whether formatting is applied to the DisplayMember property of the ListControl. (Inherited from ListControl.)
Public propertyHandleGets the window handle that the control is bound to. (Inherited from Control.)
Public propertyHasChildrenGets a value indicating whether the control contains one or more child controls. (Inherited from Control.)
Public propertyHeightGets or sets the height of the control. (Inherited from Control.)
Public propertyHorizontalExtentGets or sets the width by which the horizontal scroll bar of a ListBox can scroll.
Public propertyHorizontalScrollbarGets or sets a value indicating whether a horizontal scroll bar is displayed in the control.
Public propertyImeModeGets or sets the Input Method Editor (IME) mode of the control. (Inherited from Control.)
Protected propertyImeModeBaseGets or sets the IME mode of a control. (Inherited from Control.)
Public propertyIntegralHeightGets or sets a value indicating whether the control should resize to avoid showing partial items.
Public propertyInvokeRequiredGets a value indicating whether the caller must call an invoke method when making method calls to the control because the caller is on a different thread than the one the control was created on. (Inherited from Control.)
Public propertyIsAccessibleGets or sets a value indicating whether the control is visible to accessibility applications. (Inherited from Control.)
Public propertyIsDisposedGets a value indicating whether the control has been disposed of. (Inherited from Control.)
Public propertyIsHandleCreatedGets a value indicating whether the control has a handle associated with it. (Inherited from Control.)
Public propertyIsMirroredGets a value indicating whether the control is mirrored. (Inherited from Control.)
Public propertyItemHeightGets or sets the height of an item in the ListBox.
Public propertyItemsGets the items of the ListBox.
Public propertyLayoutEngineGets a cached instance of the control's layout engine. (Inherited from Control.)
Public propertyLeftGets or sets the distance, in pixels, between the left edge of the control and the left edge of its container's client area. (Inherited from Control.)
Public propertyLocationGets or sets the coordinates of the upper-left corner of the control relative to the upper-left corner of its container. (Inherited from Control.)
Public propertyMarginGets or sets the space between controls. (Inherited from Control.)
Public propertyMaximumSizeGets or sets the size that is the upper limit that GetPreferredSize can specify. (Inherited from Control.)
Public propertyMinimumSizeGets or sets the size that is the lower limit that GetPreferredSize can specify. (Inherited from Control.)
Public propertyMultiColumnGets or sets a value indicating whether the ListBox supports multiple columns.
Public propertyNameGets or sets the name of the control. (Inherited from Control.)
Public propertyPaddingInfrastructure. This property is not relevant to this class.
Public propertyParentGets or sets the parent container of the control. (Inherited from Control.)
Public propertyPreferredHeightGets the combined height of all items in the ListBox.
Public propertyPreferredSizeGets the size of a rectangular area into which the control can fit. (Inherited from Control.)
Public propertyProductNameGets the product name of the assembly containing the control. (Inherited from Control.)
Public propertyProductVersionGets the version of the assembly containing the control. (Inherited from Control.)
Public propertyRecreatingHandleGets a value indicating whether the control is currently re-creating its handle. (Inherited from Control.)
Public propertyRegionGets or sets the window region associated with the control. (Inherited from Control.)
Protected propertyRenderRightToLeft Obsolete. This property is now obsolete. (Inherited from Control.)
Protected propertyResizeRedrawGets or sets a value indicating whether the control redraws itself when resized. (Inherited from Control.)
Public propertyRightGets the distance, in pixels, between the right edge of the control and the left edge of its container's client area. (Inherited from Control.)
Public propertyRightToLeftGets or sets a value indicating whether text displayed by the control is displayed from right to left. (Overrides Control.RightToLeft.)
Protected propertyScaleChildrenGets a value that determines the scaling of child controls. (Inherited from Control.)
Public propertyScrollAlwaysVisibleGets or sets a value indicating whether the vertical scroll bar is shown at all times.
Public propertySelectedIndexGets or sets the zero-based index of the currently selected item in a ListBox. (Overrides ListControl.SelectedIndex.)
Public propertySelectedIndicesGets a collection that contains the zero-based indexes of all currently selected items in the ListBox.
Public propertySelectedItemGets or sets the currently selected item in the ListBox.
Public propertySelectedItemsGets a collection containing the currently selected items in the ListBox.
Public propertySelectedValueGets or sets the value of the member property specified by the ValueMember property. (Inherited from ListControl.)
Public propertySelectionModeGets or sets the method in which items are selected in the ListBox.
Protected propertyShowFocusCuesGets a value indicating whether the control should display focus rectangles. (Inherited from Control.)
Protected propertyShowKeyboardCuesGets a value indicating whether the user interface is in the appropriate state to show or hide keyboard accelerators. (Inherited from Control.)
Public propertySiteGets or sets the site of the control. (Inherited from Control.)
Public propertySizeGets or sets the height and width of the control. (Inherited from Control.)
Public propertySortedGets or sets a value indicating whether the items in the ListBox are sorted alphabetically.
Public propertyTabIndexGets or sets the tab order of the control within its container. (Inherited from Control.)
Public propertyTabStopGets or sets a value indicating whether the user can give the focus to this control using the TAB key. (Inherited from Control.)
Public propertyTagGets or sets the object that contains data about the control. (Inherited from Control.)
Public propertyTextGets or searches for the text of the currently selected item in the ListBox. (Overrides Control.Text.)
Public propertyTopGets or sets the distance, in pixels, between the top edge of the control and the top edge of its container's client area. (Inherited from Control.)
Public propertyTopIndexGets or sets the index of the first visible item in the ListBox.
Public propertyTopLevelControlGets the parent control that is not parented by another Windows Forms control. Typically, this is the outermost Form that the control is contained in. (Inherited from Control.)
Public propertyUseCustomTabOffsetsGets or sets a value indicating whether the ListBox recognizes and expands tab characters when it draws its strings by using the CustomTabOffsets integer array.
Public propertyUseTabStopsGets or sets a value indicating whether the ListBox can recognize and expand tab characters when drawing its strings.
Public propertyUseWaitCursorGets or sets a value indicating whether to use the wait cursor for the current control and all child controls. (Inherited from Control.)
Public propertyValueMemberGets or sets the path of the property to use as the actual value for the items in the ListControl. (Inherited from ListControl.)
Public propertyVisibleGets or sets a value indicating whether the control and all its child controls are displayed. (Inherited from Control.)
Public propertyWidthGets or sets the width of the control. (Inherited from Control.)
Public propertyWindowTargetInfrastructure. This property is not relevant for this class. (Inherited from Control.)
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  NameDescription
Protected methodAccessibilityNotifyClients(AccessibleEvents, Int32)Notifies the accessibility client applications of the specified AccessibleEvents for the specified child control. (Inherited from Control.)
Protected methodAccessibilityNotifyClients(AccessibleEvents, Int32, Int32)Notifies the accessibility client applications of the specified AccessibleEvents for the specified child control . (Inherited from Control.)
Protected methodAddItemsCore Obsolete. This member is obsolete, and there is no replacement.
Public methodBeginInvoke(Delegate)Executes the specified delegate asynchronously on the thread that the control's underlying handle was created on. (Inherited from Control.)
Public methodBeginInvoke(Delegate, Object())Executes the specified delegate asynchronously with the specified arguments, on the thread that the control's underlying handle was created on. (Inherited from Control.)
Public methodBeginUpdateMaintains performance while items are added to the ListBox one at a time by preventing the control from drawing until the EndUpdate method is called.
Public methodBringToFrontBrings the control to the front of the z-order. (Inherited from Control.)
Public methodClearSelectedUnselects all items in the ListBox.
Public methodContainsRetrieves a value indicating whether the specified control is a child of the control. (Inherited from Control.)
Protected methodCreateAccessibilityInstanceCreates a new accessibility object for the control. (Inherited from Control.)
Public methodCreateControlForces the creation of the visible control, including the creation of the handle and any visible child controls. (Inherited from Control.)
Protected methodCreateControlsInstanceCreates a new instance of the control collection for the control. (Inherited from Control.)
Public methodCreateGraphicsCreates the Graphics for the control. (Inherited from Control.)
Protected methodCreateHandleCreates a handle for the control. (Inherited from Control.)
Protected methodCreateItemCollectionCreates a new instance of the item collection.
Public methodCreateObjRefCreates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject.)
Protected methodDefWndProcSends the specified message to the default window procedure. (Inherited from Control.)
Protected methodDestroyHandleDestroys the handle associated with the control. (Inherited from Control.)
Public methodDisposeReleases all resources used by the Component. (Inherited from Component.)
Protected methodDispose(Boolean)Releases the unmanaged resources used by the Control and its child controls and optionally releases the managed resources. (Inherited from Control.)
Public methodDoDragDropBegins a drag-and-drop operation. (Inherited from Control.)
Public methodDrawToBitmapSupports rendering to the specified bitmap. (Inherited from Control.)
Public methodEndInvokeRetrieves the return value of the asynchronous operation represented by the IAsyncResult passed. (Inherited from Control.)
Public methodEndUpdateResumes painting the ListBox control after painting is suspended by the BeginUpdate method.
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFilterItemOnProperty(Object)Retrieves the current value of the ListControl item, if it is a property of an object, given the item. (Inherited from ListControl.)
Protected methodFilterItemOnProperty(Object, String)Returns the current value of the ListControl item, if it is a property of an object given the item and the property name. (Inherited from ListControl.)
Protected methodFinalizeReleases unmanaged resources and performs other cleanup operations before the Component is reclaimed by garbage collection. (Inherited from Component.)
Public methodFindFormRetrieves the form that the control is on. (Inherited from Control.)
Public methodFindString(String)Finds the first item in the ListBox that starts with the specified string.
Public methodFindString(String, Int32)Finds the first item in the ListBox that starts with the specified string. The search starts at a specific starting index.
Public methodFindStringExact(String)Finds the first item in the ListBox that exactly matches the specified string.
Public methodFindStringExact(String, Int32)Finds the first item in the ListBox that exactly matches the specified string. The search starts at a specific starting index.
Public methodFocusSets input focus to the control. (Inherited from Control.)
Protected methodGetAccessibilityObjectByIdRetrieves the specified AccessibleObject. (Inherited from Control.)
Protected methodGetAutoSizeModeRetrieves a value indicating how a control will behave when its AutoSize property is enabled. (Inherited from Control.)
Public methodGetChildAtPoint(Point)Retrieves the child control that is located at the specified coordinates. (Inherited from Control.)
Public methodGetChildAtPoint(Point, GetChildAtPointSkip)Retrieves the child control that is located at the specified coordinates, specifying whether to ignore child controls of a certain type. (Inherited from Control.)
Public methodGetContainerControlReturns the next ContainerControl up the control's chain of parent controls. (Inherited from Control.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetItemHeightReturns the height of an item in the ListBox.
Public methodGetItemRectangleReturns the bounding rectangle for an item in the ListBox.
Public methodGetItemTextReturns the text representation of the specified item. (Inherited from ListControl.)
Public methodGetLifetimeServiceRetrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject.)
Public methodGetNextControlRetrieves the next control forward or back in the tab order of child controls. (Inherited from Control.)
Public methodGetPreferredSizeRetrieves the size of a rectangular area into which a control can be fitted. (Inherited from Control.)
Protected methodGetScaledBoundsRetrieves the bounds within which the ListBox is scaled. (Overrides Control.GetScaledBounds(Rectangle, SizeF, BoundsSpecified).)
Public methodGetSelectedReturns a value indicating whether the specified item is selected.
Protected methodGetServiceReturns an object that represents a service provided by the Component or by its Container. (Inherited from Component.)
Protected methodGetStyleRetrieves the value of the specified control style bit for the control. (Inherited from Control.)
Protected methodGetTopLevelDetermines if the control is a top-level control. (Inherited from Control.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodHideConceals the control from the user. (Inherited from Control.)
Public methodIndexFromPoint(Point)Returns the zero-based index of the item at the specified coordinates.
Public methodIndexFromPoint(Int32, Int32)Returns the zero-based index of the item at the specified coordinates.
Public methodInitializeLifetimeServiceObtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject.)
Protected methodInitLayoutCalled after the control has been added to another container. (Inherited from Control.)
Public methodInvalidateInvalidates the entire surface of the control and causes the control to be redrawn. (Inherited from Control.)
Public methodInvalidate(Boolean)Invalidates a specific region of the control and causes a paint message to be sent to the control. Optionally, invalidates the child controls assigned to the control. (Inherited from Control.)
Public methodInvalidate(Rectangle)Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control. (Inherited from Control.)
Public methodInvalidate(Region)Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control. (Inherited from Control.)
Public methodInvalidate(Rectangle, Boolean)Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control. Optionally, invalidates the child controls assigned to the control. (Inherited from Control.)
Public methodInvalidate(Region, Boolean)Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control. Optionally, invalidates the child controls assigned to the control. (Inherited from Control.)
Public methodInvoke(Delegate)Executes the specified delegate on the thread that owns the control's underlying window handle. (Inherited from Control.)
Public methodInvoke(Delegate, Object())Executes the specified delegate, on the thread that owns the control's underlying window handle, with the specified list of arguments. (Inherited from Control.)
Protected methodInvokeGotFocusRaises the GotFocus event for the specified control. (Inherited from Control.)
Protected methodInvokeLostFocusRaises the LostFocus event for the specified control. (Inherited from Control.)
Protected methodInvokeOnClickRaises the Click event for the specified control. (Inherited from Control.)
Protected methodInvokePaintRaises the Paint event for the specified control. (Inherited from Control.)
Protected methodInvokePaintBackgroundRaises the PaintBackground event for the specified control. (Inherited from Control.)
Protected methodIsInputCharDetermines if a character is an input character that the control recognizes. (Inherited from Control.)
Protected methodIsInputKeyHandles special input keys, such as PAGE UP, PAGE DOWN, HOME, END, and so on. (Inherited from ListControl.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Protected methodMemberwiseClone(Boolean)Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject.)
Protected methodNotifyInvalidateInfrastructure. Raises the Invalidated event with a specified region of the control to invalidate. (Inherited from Control.)
Protected methodOnAutoSizeChangedRaises the AutoSizeChanged event. (Inherited from Control.)
Protected methodOnBackColorChangedRaises the BackColorChanged event. (Inherited from Control.)
Protected methodOnBackgroundImageChangedRaises the BackgroundImageChanged event. (Inherited from Control.)
Protected methodOnBackgroundImageLayoutChangedRaises the BackgroundImageLayoutChanged event. (Inherited from Control.)
Protected methodOnBindingContextChangedRaises the BindingContextChanged event. (Inherited from ListControl.)
Protected methodOnCausesValidationChangedRaises the CausesValidationChanged event. (Inherited from Control.)
Protected methodOnChangeUICuesRaises the ChangeUICues event. (Overrides Control.OnChangeUICues(UICuesEventArgs).)
Protected methodOnClickRaises the Click event. (Inherited from Control.)
Protected methodOnClientSizeChangedRaises the ClientSizeChanged event. (Inherited from Control.)
Protected methodOnContextMenuChangedRaises the ContextMenuChanged event. (Inherited from Control.)
Protected methodOnContextMenuStripChangedRaises the ContextMenuStripChanged event. (Inherited from Control.)
Protected methodOnControlAddedRaises the ControlAdded event. (Inherited from Control.)
Protected methodOnControlRemovedRaises the ControlRemoved event. (Inherited from Control.)
Protected methodOnCreateControlRaises the CreateControl method. (Inherited from Control.)
Protected methodOnCursorChangedRaises the CursorChanged event. (Inherited from Control.)
Protected methodOnDataSourceChangedRaises the DataSourceChanged event. (Overrides ListControl.OnDataSourceChanged(EventArgs).)
Protected methodOnDisplayMemberChangedRaises the DisplayMemberChanged event. (Overrides ListControl.OnDisplayMemberChanged(EventArgs).)
Protected methodOnDockChangedRaises the DockChanged event. (Inherited from Control.)
Protected methodOnDoubleClickRaises the DoubleClick event. (Inherited from Control.)
Protected methodOnDragDropRaises the DragDrop event. (Inherited from Control.)
Protected methodOnDragEnterRaises the DragEnter event. (Inherited from Control.)
Protected methodOnDragLeaveRaises the DragLeave event. (Inherited from Control.)
Protected methodOnDragOverRaises the DragOver event. (Inherited from Control.)
Protected methodOnDrawItemRaises the DrawItem event.
Protected methodOnEnabledChangedRaises the EnabledChanged event. (Inherited from Control.)
Protected methodOnEnterRaises the Enter event. (Inherited from Control.)
Protected methodOnFontChangedRaises the FontChanged event. (Overrides Control.OnFontChanged(EventArgs).)
Protected methodOnForeColorChangedRaises the ForeColorChanged event. (Inherited from Control.)
Protected methodOnFormatRaises the Format event. (Inherited from ListControl.)
Protected methodOnFormatInfoChangedRaises the FormatInfoChanged event. (Inherited from ListControl.)
Protected methodOnFormatStringChangedRaises the FormatStringChanged event. (Inherited from ListControl.)
Protected methodOnFormattingEnabledChangedRaises the FormattingEnabledChanged event. (Inherited from ListControl.)
Protected methodOnGiveFeedbackRaises the GiveFeedback event. (Inherited from Control.)
Protected methodOnGotFocusRaises the GotFocus event. (Inherited from Control.)
Protected methodOnHandleCreatedSpecifies when the window handle has been created so that column width and other characteristics can be set. Inheriting classes should call base.OnHandleCreated. (Overrides Control.OnHandleCreated(EventArgs).)
Protected methodOnHandleDestroyedOverridden to be sure that items are set up and cleared out correctly. Inheriting controls should call base.OnHandleDestroyed. (Overrides Control.OnHandleDestroyed(EventArgs).)
Protected methodOnHelpRequestedRaises the HelpRequested event. (Inherited from Control.)
Protected methodOnImeModeChangedRaises the ImeModeChanged event. (Inherited from Control.)
Protected methodOnInvalidatedRaises the Invalidated event. (Inherited from Control.)
Protected methodOnKeyDownRaises the KeyDown event. (Inherited from Control.)
Protected methodOnKeyPressRaises the KeyPress event. (Inherited from Control.)
Protected methodOnKeyUpRaises the KeyUp event. (Inherited from Control.)
Protected methodOnLayoutRaises the Layout event. (Inherited from Control.)
Protected methodOnLeaveRaises the Leave event. (Inherited from Control.)
Protected methodOnLocationChangedRaises the LocationChanged event. (Inherited from Control.)
Protected methodOnLostFocusRaises the LostFocus event. (Inherited from Control.)
Protected methodOnMarginChangedRaises the MarginChanged event. (Inherited from Control.)
Protected methodOnMeasureItemRaises the MeasureItem event.
Protected methodOnMouseCaptureChangedRaises the MouseCaptureChanged event. (Inherited from Control.)
Protected methodOnMouseClickRaises the MouseClick event. (Inherited from Control.)
Protected methodOnMouseDoubleClickRaises the MouseDoubleClick event. (Inherited from Control.)
Protected methodOnMouseDownRaises the MouseDown event. (Inherited from Control.)
Protected methodOnMouseEnterRaises the MouseEnter event. (Inherited from Control.)
Protected methodOnMouseHoverRaises the MouseHover event. (Inherited from Control.)
Protected methodOnMouseLeaveRaises the MouseLeave event. (Inherited from Control.)
Protected methodOnMouseMoveRaises the MouseMove event. (Inherited from Control.)
Protected methodOnMouseUpRaises the MouseUp event. (Inherited from Control.)
Protected methodOnMouseWheelRaises the MouseWheel event. (Inherited from Control.)
Protected methodOnMoveRaises the Move event. (Inherited from Control.)
Protected methodOnNotifyMessageNotifies the control of Windows messages. (Inherited from Control.)
Protected methodOnPaddingChangedRaises the PaddingChanged event. (Inherited from Control.)
Protected methodOnPaintRaises the Paint event. (Inherited from Control.)
Protected methodOnPaintBackgroundPaints the background of the control. (Inherited from Control.)
Protected methodOnParentBackColorChangedRaises the BackColorChanged event when the BackColor property value of the control's container changes. (Inherited from Control.)
Protected methodOnParentBackgroundImageChangedRaises the BackgroundImageChanged event when the BackgroundImage property value of the control's container changes. (Inherited from Control.)
Protected methodOnParentBindingContextChangedRaises the BindingContextChanged event when the BindingContext property value of the control's container changes. (Inherited from Control.)
Protected methodOnParentChangedRaises the ParentChanged event. (Overrides Control.OnParentChanged(EventArgs).)
Protected methodOnParentCursorChangedRaises the CursorChanged event. (Inherited from Control.)
Protected methodOnParentEnabledChangedRaises the EnabledChanged event when the Enabled property value of the control's container changes. (Inherited from Control.)
Protected methodOnParentFontChangedRaises the FontChanged event when the Font property value of the control's container changes. (Inherited from Control.)
Protected methodOnParentForeColorChangedRaises the ForeColorChanged event when the ForeColor property value of the control's container changes. (Inherited from Control.)
Protected methodOnParentRightToLeftChangedRaises the RightToLeftChanged event when the RightToLeft property value of the control's container changes. (Inherited from Control.)
Protected methodOnParentVisibleChangedRaises the VisibleChanged event when the Visible property value of the control's container changes. (Inherited from Control.)
Protected methodOnPreviewKeyDownRaises the PreviewKeyDown event. (Inherited from Control.)
Protected methodOnPrintRaises the Paint event. (Inherited from Control.)
Protected methodOnQueryContinueDragRaises the QueryContinueDrag event. (Inherited from Control.)
Protected methodOnRegionChangedRaises the RegionChanged event. (Inherited from Control.)
Protected methodOnResizeRaises the Resize event. (Overrides Control.OnResize(EventArgs).)
Protected methodOnRightToLeftChangedRaises the RightToLeftChanged event. (Inherited from Control.)
Protected methodOnSelectedIndexChangedRaises the SelectedValueChanged event. (Overrides ListControl.OnSelectedIndexChanged(EventArgs).)
Protected methodOnSelectedValueChangedRaises the SelectedValueChanged event. (Overrides ListControl.OnSelectedValueChanged(EventArgs).)
Protected methodOnSizeChangedRaises the SizeChanged event. (Inherited from Control.)
Protected methodOnStyleChangedRaises the StyleChanged event. (Inherited from Control.)
Protected methodOnSystemColorsChangedRaises the SystemColorsChanged event. (Inherited from Control.)
Protected methodOnTabIndexChangedRaises the TabIndexChanged event. (Inherited from Control.)
Protected methodOnTabStopChangedRaises the TabStopChanged event. (Inherited from Control.)
Protected methodOnTextChangedRaises the TextChanged event. (Inherited from Control.)
Protected methodOnValidatedRaises the Validated event. (Inherited from Control.)
Protected methodOnValidatingRaises the Validating event. (Inherited from Control.)
Protected methodOnValueMemberChangedRaises the ValueMemberChanged event. (Inherited from ListControl.)
Protected methodOnVisibleChangedRaises the VisibleChanged event. (Inherited from Control.)
Public methodPerformLayoutForces the control to apply layout logic to all its child controls. (Inherited from Control.)
Public methodPerformLayout(Control, String)Forces the control to apply layout logic to all its child controls. (Inherited from Control.)
Public methodPointToClientComputes the location of the specified screen point into client coordinates. (Inherited from Control.)
Public methodPointToScreenComputes the location of the specified client point into screen coordinates. (Inherited from Control.)
Public methodPreProcessControlMessagePreprocesses keyboard or input messages within the message loop before they are dispatched. (Inherited from Control.)
Public methodPreProcessMessagePreprocesses keyboard or input messages within the message loop before they are dispatched. (Inherited from Control.)
Protected methodProcessCmdKeyProcesses a command key. (Inherited from Control.)
Protected methodProcessDialogCharProcesses a dialog character. (Inherited from Control.)
Protected methodProcessDialogKeyProcesses a dialog key. (Inherited from Control.)
Protected methodProcessKeyEventArgsProcesses a key message and generates the appropriate control events. (Inherited from Control.)
Protected methodProcessKeyMessageProcesses a keyboard message. (Inherited from Control.)
Protected methodProcessKeyPreviewPreviews a keyboard message. (Inherited from Control.)
Protected methodProcessMnemonicProcesses a mnemonic character. (Inherited from Control.)
Protected methodRaiseDragEventInfrastructure. Raises the appropriate drag event. (Inherited from Control.)
Protected methodRaiseKeyEventInfrastructure. Raises the appropriate key event. (Inherited from Control.)
Protected methodRaiseMouseEventInfrastructure. Raises the appropriate mouse event. (Inherited from Control.)
Protected methodRaisePaintEventInfrastructure. Raises the appropriate paint event. (Inherited from Control.)
Protected methodRecreateHandleForces the re-creation of the handle for the control. (Inherited from Control.)
Public methodRectangleToClientComputes the size and location of the specified screen rectangle in client coordinates. (Inherited from Control.)
Public methodRectangleToScreenComputes the size and location of the specified client rectangle in screen coordinates. (Inherited from Control.)
Public methodRefreshForces the control to invalidate its client area and immediately redraw itself and any child controls. (Overrides Control.Refresh.)
Protected methodRefreshItemInfrastructure. Refreshes the item contained at the specified index. (Overrides ListControl.RefreshItem(Int32).)
Protected methodRefreshItemsRefreshes all ListBox items and retrieves new strings for them. (Overrides ListControl.RefreshItems.)
Public methodResetBackColorResets the BackColor property to its default value. (Overrides Control.ResetBackColor.)
Public methodResetBindingsCauses a control bound to the BindingSource to reread all the items in the list and refresh their displayed values. (Inherited from Control.)
Public methodResetCursorResets the Cursor property to its default value. (Inherited from Control.)
Public methodResetFontResets the Font property to its default value. (Inherited from Control.)
Public methodResetForeColorResets the ForeColor property to its default value. (Overrides Control.ResetForeColor.)
Public methodResetImeModeResets the ImeMode property to its default value. (Inherited from Control.)
Protected methodResetMouseEventArgsInfrastructure. Resets the control to handle the MouseLeave event. (Inherited from Control.)
Public methodResetRightToLeftResets the RightToLeft property to its default value. (Inherited from Control.)
Public methodResetTextResets the Text property to its default value. (Inherited from Control.)
Public methodResumeLayoutResumes usual layout logic. (Inherited from Control.)
Public methodResumeLayout(Boolean)Resumes usual layout logic, optionally forcing an immediate layout of pending layout requests. (Inherited from Control.)
Protected methodRtlTranslateAlignment(ContentAlignment)Converts the specified ContentAlignment to the appropriate ContentAlignment to support right-to-left text. (Inherited from Control.)
Protected methodRtlTranslateAlignment(HorizontalAlignment)Converts the specified HorizontalAlignment to the appropriate HorizontalAlignment to support right-to-left text. (Inherited from Control.)
Protected methodRtlTranslateAlignment(LeftRightAlignment)Converts the specified LeftRightAlignment to the appropriate LeftRightAlignment to support right-to-left text. (Inherited from Control.)
Protected methodRtlTranslateContentConverts the specified ContentAlignment to the appropriate ContentAlignment to support right-to-left text. (Inherited from Control.)
Protected methodRtlTranslateHorizontalConverts the specified HorizontalAlignment to the appropriate HorizontalAlignment to support right-to-left text. (Inherited from Control.)
Protected methodRtlTranslateLeftRightConverts the specified LeftRightAlignment to the appropriate LeftRightAlignment to support right-to-left text. (Inherited from Control.)
Public methodScale(Single) Obsolete. Scales the control and any child controls. (Inherited from Control.)
Public methodScale(SizeF)Scales the control and all child controls by the specified scaling factor. (Inherited from Control.)
Public methodScale(Single, Single) Obsolete. Scales the entire control and any child controls. (Inherited from Control.)
Protected methodScaleControlScales a control's location, size, padding and margin. (Overrides Control.ScaleControl(SizeF, BoundsSpecified).)
Protected methodScaleCoreInfrastructure. This method is not relevant for this class. (Inherited from Control.)
Public methodSelectActivates the control. (Inherited from Control.)
Protected methodSelect(Boolean, Boolean)Activates a child control. Optionally specifies the direction in the tab order to select the control from. (Inherited from Control.)
Public methodSelectNextControlActivates the next control. (Inherited from Control.)
Public methodSendToBackSends the control to the back of the z-order. (Inherited from Control.)
Protected methodSetAutoSizeModeSets a value indicating how a control will behave when its AutoSize property is enabled. (Inherited from Control.)
Public methodSetBounds(Int32, Int32, Int32, Int32)Sets the bounds of the control to the specified location and size. (Inherited from Control.)
Public methodSetBounds(Int32, Int32, Int32, Int32, BoundsSpecified)Sets the specified bounds of the control to the specified location and size. (Inherited from Control.)
Protected methodSetBoundsCoreInfrastructure. Sets the specified bounds of the ListBox control. (Overrides Control.SetBoundsCore(Int32, Int32, Int32, Int32, BoundsSpecified).)
Protected methodSetClientSizeCoreSets the size of the client area of the control. (Inherited from Control.)
Protected methodSetItemCoreSets the object with the specified index in the derived class. (Overrides ListControl.SetItemCore(Int32, Object).)
Protected methodSetItemsCoreClears the contents of the ListBox and adds the specified items to the control. (Overrides ListControl.SetItemsCore(IList).)
Public methodSetSelectedSelects or clears the selection for the specified item in a ListBox.
Protected methodSetStyleSets a specified ControlStyles flag to either true or false. (Inherited from Control.)
Protected methodSetTopLevelSets the control as the top-level control. (Inherited from Control.)
Protected methodSetVisibleCoreSets the control to the specified visible state. (Inherited from Control.)
Public methodShowDisplays the control to the user. (Inherited from Control.)
Protected methodSizeFromClientSizeDetermines the size of the entire control from the height and width of its client area. (Inherited from Control.)
Protected methodSortSorts the items in the ListBox.
Public methodSuspendLayoutTemporarily suspends the layout logic for the control. (Inherited from Control.)
Public methodToStringInfrastructure. Returns a string representation of the ListBox. (Overrides Component.ToString.)
Public methodUpdateCauses the control to redraw the invalidated regions within its client area. (Inherited from Control.)
Protected methodUpdateBoundsUpdates the bounds of the control with the current size and location. (Inherited from Control.)
Protected methodUpdateBounds(Int32, Int32, Int32, Int32)Updates the bounds of the control with the specified size and location. (Inherited from Control.)
Protected methodUpdateBounds(Int32, Int32, Int32, Int32, Int32, Int32)Updates the bounds of the control with the specified size, location, and client size. (Inherited from Control.)
Protected methodUpdateStylesForces the assigned styles to be reapplied to the control. (Inherited from Control.)
Protected methodUpdateZOrderUpdates the control in its parent's z-order. (Inherited from Control.)
Protected methodWmReflectCommandInfrastructure. Processes the command message the ListView control receives from the top-level window.
Protected methodWndProcThe list's window procedure. (Overrides Control.WndProc(Message).)
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  NameDescription
Public eventAutoSizeChangedInfrastructure. This event is not relevant for this class. (Inherited from Control.)
Public eventBackColorChangedOccurs when the value of the BackColor property changes. (Inherited from Control.)
Public eventBackgroundImageChangedInfrastructure. Occurs when the BackgroundImage property of the label changes.
Public eventBackgroundImageLayoutChangedInfrastructure. Occurs when the BackgroundImageLayout property changes.
Public eventBindingContextChangedOccurs when the value of the BindingContext property changes. (Inherited from Control.)
Public eventCausesValidationChangedOccurs when the value of the CausesValidation property changes. (Inherited from Control.)
Public eventChangeUICuesOccurs when the focus or keyboard user interface (UI) cues change. (Inherited from Control.)
Public eventClickInfrastructure. Occurs when the ListBox control is clicked.
Public eventClientSizeChangedOccurs when the value of the ClientSize property changes. (Inherited from Control.)
Public eventContextMenuChangedOccurs when the value of the ContextMenu property changes. (Inherited from Control.)
Public eventContextMenuStripChangedOccurs when the value of the ContextMenuStrip property changes. (Inherited from Control.)
Public eventControlAddedOccurs when a new control is added to the Control.ControlCollection. (Inherited from Control.)
Public eventControlRemovedOccurs when a control is removed from the Control.ControlCollection. (Inherited from Control.)
Public eventCursorChangedOccurs when the value of the Cursor property changes. (Inherited from Control.)
Public eventDataSourceChangedOccurs when the DataSource changes. (Inherited from ListControl.)
Public eventDisplayMemberChangedOccurs when the DisplayMember property changes. (Inherited from ListControl.)
Public eventDisposedOccurs when the component is disposed by a call to the Dispose method. (Inherited from Component.)
Public eventDockChangedOccurs when the value of the Dock property changes. (Inherited from Control.)
Public eventDoubleClickOccurs when the control is double-clicked. (Inherited from Control.)
Public eventDragDropOccurs when a drag-and-drop operation is completed. (Inherited from Control.)
Public eventDragEnterOccurs when an object is dragged into the control's bounds. (Inherited from Control.)
Public eventDragLeaveOccurs when an object is dragged out of the control's bounds. (Inherited from Control.)
Public eventDragOverOccurs when an object is dragged over the control's bounds. (Inherited from Control.)
Public eventDrawItemOccurs when a visual aspect of an owner-drawn ListBox changes.
Public eventEnabledChangedOccurs when the Enabled property value has changed. (Inherited from Control.)
Public eventEnterOccurs when the control is entered. (Inherited from Control.)
Public eventFontChangedOccurs when the Font property value changes. (Inherited from Control.)
Public eventForeColorChangedOccurs when the ForeColor property value changes. (Inherited from Control.)
Public eventFormatOccurs when the control is bound to a data value. (Inherited from ListControl.)
Public eventFormatInfoChangedOccurs when the value of the FormatInfo property changes. (Inherited from ListControl.)
Public eventFormatStringChangedOccurs when value of the FormatString property changes (Inherited from ListControl.)
Public eventFormattingEnabledChangedOccurs when the value of the FormattingEnabled property changes. (Inherited from ListControl.)
Public eventGiveFeedbackOccurs during a drag operation. (Inherited from Control.)
Public eventGotFocusOccurs when the control receives focus. (Inherited from Control.)
Public eventHandleCreatedOccurs when a handle is created for the control. (Inherited from Control.)
Public eventHandleDestroyedOccurs when the control's handle is in the process of being destroyed. (Inherited from Control.)
Public eventHelpRequestedOccurs when the user requests help for a control. (Inherited from Control.)
Public eventImeModeChangedOccurs when the ImeMode property has changed. (Inherited from Control.)
Public eventInvalidatedOccurs when a control's display requires redrawing. (Inherited from Control.)
Public eventKeyDownOccurs when a key is pressed while the control has focus. (Inherited from Control.)
Public eventKeyPressOccurs when a key is pressed while the control has focus. (Inherited from Control.)
Public eventKeyUpOccurs when a key is released while the control has focus. (Inherited from Control.)
Public eventLayoutOccurs when a control should reposition its child controls. (Inherited from Control.)
Public eventLeaveOccurs when the input focus leaves the control. (Inherited from Control.)
Public eventLocationChangedOccurs when the Location property value has changed. (Inherited from Control.)
Public eventLostFocusOccurs when the control loses focus. (Inherited from Control.)
Public eventMarginChangedOccurs when the control's margin changes. (Inherited from Control.)
Public eventMeasureItemOccurs when an owner-drawn ListBox is created and the sizes of the list items are determined.
Public eventMouseCaptureChangedOccurs when the control loses mouse capture. (Inherited from Control.)
Public eventMouseClickInfrastructure. Occurs when the user clicks the ListBox control with the mouse pointer.
Public eventMouseDoubleClickOccurs when the control is double clicked by the mouse. (Inherited from Control.)
Public eventMouseDownOccurs when the mouse pointer is over the control and a mouse button is pressed. (Inherited from Control.)
Public eventMouseEnterOccurs when the mouse pointer enters the control. (Inherited from Control.)
Public eventMouseHoverOccurs when the mouse pointer rests on the control. (Inherited from Control.)
Public eventMouseLeaveOccurs when the mouse pointer leaves the control. (Inherited from Control.)
Public eventMouseMoveOccurs when the mouse pointer is moved over the control. (Inherited from Control.)
Public eventMouseUpOccurs when the mouse pointer is over the control and a mouse button is released. (Inherited from Control.)
Public eventMouseWheelOccurs when the mouse wheel moves while the control has focus. (Inherited from Control.)
Public eventMoveOccurs when the control is moved. (Inherited from Control.)
Public eventPaddingChangedOccurs when the value of the Padding property changes.
Public eventPaintInfrastructure. Occurs when the ListBox control is painted.
Public eventParentChangedOccurs when the Parent property value changes. (Inherited from Control.)
Public eventPreviewKeyDownOccurs before the KeyDown event when a key is pressed while focus is on this control. (Inherited from Control.)
Public eventQueryAccessibilityHelpOccurs when AccessibleObject is providing help to accessibility applications. (Inherited from Control.)
Public eventQueryContinueDragOccurs during a drag-and-drop operation and enables the drag source to determine whether the drag-and-drop operation should be canceled. (Inherited from Control.)
Public eventRegionChangedOccurs when the value of the Region property changes. (Inherited from Control.)
Public eventResizeOccurs when the control is resized. (Inherited from Control.)
Public eventRightToLeftChangedOccurs when the RightToLeft property value changes. (Inherited from Control.)
Public eventSelectedIndexChangedOccurs when the SelectedIndex property or the SelectedIndices collection has changed.
Public eventSelectedValueChangedOccurs when the SelectedValue property changes. (Inherited from ListControl.)
Public eventSizeChangedOccurs when the Size property value changes. (Inherited from Control.)
Public eventStyleChangedOccurs when the control style changes. (Inherited from Control.)
Public eventSystemColorsChangedOccurs when the system colors change. (Inherited from Control.)
Public eventTabIndexChangedOccurs when the TabIndex property value changes. (Inherited from Control.)
Public eventTabStopChangedOccurs when the TabStop property value changes. (Inherited from Control.)
Public eventTextChangedInfrastructure. Occurs when the Text property is changed.
Public eventValidatedOccurs when the control is finished validating. (Inherited from Control.)
Public eventValidatingOccurs when the control is validating. (Inherited from Control.)
Public eventValueMemberChangedOccurs when the ValueMember property changes. (Inherited from ListControl.)
Public eventVisibleChangedOccurs when the Visible property value changes. (Inherited from Control.)
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  NameDescription
Public fieldStatic memberDefaultItemHeightSpecifies the default item height for an owner-drawn ListBox.
Public fieldStatic memberNoMatchesSpecifies that no matches are found during a search.
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  NameDescription
Explicit interface implemetationPrivate methodIDropTarget.OnDragDropInfrastructure. Raises the DragDrop event. (Inherited from Control.)
Explicit interface implemetationPrivate methodIDropTarget.OnDragEnterInfrastructure. Raises the DragEnter event. (Inherited from Control.)
Explicit interface implemetationPrivate methodIDropTarget.OnDragLeaveInfrastructure. Raises the DragLeave event. (Inherited from Control.)
Explicit interface implemetationPrivate methodIDropTarget.OnDragOverInfrastructure. Raises the DragOver event. (Inherited from Control.)
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The ListBox control enables you to display a list of items to the user that the user can select by clicking. A ListBox control can provide single or multiple selections using the SelectionMode property. The ListBox also provides the MultiColumn property to enable the display of items in columns instead of a straight vertical list of items. With this, the control can display more visible items and the user no longer needs to scroll to an item.

Typically, Windows handles the task of drawing the items to display in the ListBox. You can use the DrawMode property, and handle the MeasureItem and DrawItem events so you can override the automatic drawing that Windows provides and draw the items yourself. You can use owner-drawn ListBox controls to display variable-height items, images, or a different color or font for the text of each item in the list. The HorizontalExtent property, GetItemHeight, and GetItemRectangle also help you draw your own items.

In addition to display and selection functionality, the ListBox also provides features that enable you to efficiently add items to the ListBox and to find text within the items of the list. The BeginUpdate and EndUpdate methods enable you to add a large number of items to the ListBox without the control being repainted each time an item is added to the list. The FindString and FindStringExact methods enable you to search for an item in the list that contains a specific search string.

The Items, SelectedItems, and SelectedIndices properties provide access to the three collections that are used by the ListBox. The following table outlines the three collections used by the ListBox and their use within the control.

Collection class

Use within the ListBox

ListBox.ObjectCollection

Contains all items contained in the ListBox control.

ListBox.SelectedObjectCollection

Contains a collection of the selected items which is a subset of the items contained in the ListBox control.

ListBox.SelectedIndexCollection

Contains a collection of the selected indexes, which is a subset of the indexes of the ListBox.ObjectCollection. These indexes specify items that are selected.

The following three examples show the three indexed collections that the ListBox class supports.

The following table shows an example of how the ListBox.ObjectCollection stores the items of the ListBox as well as their selection state within an example ListBox.

Index

Item

Selection state within the ListBox

0

object1

Unselected

1

object2

Selected

2

object3

Unselected

3

object4

Selected

4

object5

Selected

Based on the ListBox.ObjectCollection shown in the previous table, this table shows how the ListBox.SelectedObjectCollection would appear.

Index

Item

0

object2

1

object4

2

object5

Based on the ListBox.ObjectCollection shown in the previous table, this table shows how the ListBox.SelectedIndexCollection would appear.

Index

Index of item

0

1

1

3

2

4

The Add method of the ListBox.ObjectCollection class enables you to add items to the ListBox. The Add method can accept any object when adding a member to the ListBox. When an object is being added to the ListBox, the control uses the text defined in the ToString method of the object unless a member name within the object is specified in the DisplayMember property. In addition to adding items using the Add method of the ListBox.ObjectCollection class you can also add items using the DataSource property of the ListControl class.

NoteNote

If you have a ListBox, ComboBox, or CheckedListBox on a base Windows form and want to modify the string collections of those controls in a derived Windows form, the string collections of those controls in the base Windows form must be empty. If the string collections are not empty, they become read-only when you derive another Windows form.

The following code example demonstrates how to create a ListBox control that displays multiple items in columns and can have more than one item selected in the control's list. The code for the example adds 50 items to the ListBox using the Add method of the ListBox.ObjectCollection class and then selects three items from the list using the SetSelected method. The code then displays values from the ListBox.SelectedObjectCollection collection, through the SelectedItems property, and the ListBox.SelectedIndexCollection, through the SelectedIndices property. This example requires that the code is located in and called from a Form.


 Private Sub button1_Click(sender As Object, e As System.EventArgs)
     ' Create an instance of the ListBox.
     Dim listBox1 As New ListBox()
     ' Set the size and location of the ListBox.
     listBox1.Size = New System.Drawing.Size(200, 100)
     listBox1.Location = New System.Drawing.Point(10, 10)
     ' Add the ListBox to the form.
     Me.Controls.Add(listBox1)
     ' Set the ListBox to display items in multiple columns.
     listBox1.MultiColumn = True
     ' Set the selection mode to multiple and extended.
     listBox1.SelectionMode = SelectionMode.MultiExtended

     ' Shutdown the painting of the ListBox as items are added.
     listBox1.BeginUpdate()
     ' Loop through and add 50 items to the ListBox.
     Dim x As Integer
     For x = 1 To 50
         listBox1.Items.Add("Item " & x.ToString())
     Next x
     ' Allow the ListBox to repaint and display the new items.
     listBox1.EndUpdate()

     ' Select three items from the ListBox.
     listBox1.SetSelected(1, True)
     listBox1.SetSelected(3, True)
     listBox1.SetSelected(5, True)

     ' Display the second selected item in the ListBox to the console.
     System.Diagnostics.Debug.WriteLine(listBox1.SelectedItems(1).ToString())
     ' Display the index of the first selected item in the ListBox.
     System.Diagnostics.Debug.WriteLine(listBox1.SelectedIndices(0).ToString())
 End Sub



.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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