DropDownList Class

 

Represents a control that allows the user to select a single item from a drop-down list.

Namespace:   System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

System::Object
  System.Web.UI::Control
    System.Web.UI.WebControls::WebControl
      System.Web.UI.WebControls::BaseDataBoundControl
        System.Web.UI.WebControls::DataBoundControl
          System.Web.UI.WebControls::ListControl
            System.Web.UI.WebControls::DropDownList

[ValidationPropertyAttribute("SelectedItem")]
public ref class DropDownList : ListControl, IPostBackDataHandler

NameDescription
System_CAPS_pubmethodDropDownList()

Initializes a new instance of the DropDownList class.

NameDescription
System_CAPS_pubpropertyAccessKey

Gets or sets the access key that allows you to quickly navigate to the Web server control.(Inherited from WebControl.)

System_CAPS_protpropertyAdapter

Gets the browser-specific adapter for the control.(Inherited from Control.)

System_CAPS_pubpropertyAppendDataBoundItems

Gets or sets a value that indicates whether list items are cleared before data binding.(Inherited from ListControl.)

System_CAPS_pubpropertyAppRelativeTemplateSourceDirectory

Gets or sets the application-relative virtual directory of the Page or UserControl object that contains this control.(Inherited from Control.)

System_CAPS_pubpropertyAttributes

Gets the collection of arbitrary attributes (for rendering only) that do not correspond to properties on the control.(Inherited from WebControl.)

System_CAPS_pubpropertyAutoPostBack

Gets or sets a value indicating whether a postback to the server automatically occurs when the user changes the list selection.(Inherited from ListControl.)

System_CAPS_pubpropertyBackColor

Gets or sets the background color of the Web server control.(Inherited from WebControl.)

System_CAPS_pubpropertyBindingContainer

This API supports the product infrastructure and is not intended to be used directly from your code. Gets the control that contains this control's data binding.(Inherited from Control.)

System_CAPS_pubpropertyBorderColor

Gets or sets the border color of the control.(Overrides WebControl::BorderColor.)

System_CAPS_pubpropertyBorderStyle

Gets or sets the border style of the control.(Overrides WebControl::BorderStyle.)

System_CAPS_pubpropertyBorderWidth

Gets or sets the border width for the control.(Overrides WebControl::BorderWidth.)

System_CAPS_pubpropertyCausesValidation

Gets or sets a value indicating whether validation is performed when a control that is derived from the ListControl class is clicked.(Inherited from ListControl.)

System_CAPS_protpropertyChildControlsCreated

Gets a value that indicates whether the server control's child controls have been created.(Inherited from Control.)

System_CAPS_pubpropertyClientID

Gets the control ID for HTML markup that is generated by ASP.NET.(Inherited from Control.)

System_CAPS_pubpropertyClientIDMode

Gets or sets the algorithm that is used to generate the value of the ClientID property.(Inherited from Control.)

System_CAPS_protpropertyClientIDSeparator

Gets a character value representing the separator character used in the ClientID property.(Inherited from Control.)

System_CAPS_protpropertyContext

Gets the HttpContext object associated with the server control for the current Web request.(Inherited from Control.)

System_CAPS_pubpropertyControls

Gets a ControlCollection object that represents the child controls for a specified server control in the UI hierarchy.(Inherited from Control.)

System_CAPS_pubpropertyControlStyle

Gets the style of the Web server control. This property is used primarily by control developers.(Inherited from WebControl.)

System_CAPS_pubpropertyControlStyleCreated

Gets a value indicating whether a Style object has been created for the ControlStyle property. This property is primarily used by control developers.(Inherited from WebControl.)

System_CAPS_pubpropertyCssClass

Gets or sets the Cascading Style Sheet (CSS) class rendered by the Web server control on the client.(Inherited from WebControl.)

System_CAPS_pubpropertyDataItemContainer

Gets a reference to the naming container if the naming container implements IDataItemContainer.(Inherited from Control.)

System_CAPS_pubpropertyDataKeysContainer

Gets a reference to the naming container if the naming container implements IDataKeysControl.(Inherited from Control.)

System_CAPS_pubpropertyDataMember

Gets or sets the name of the list of data that the data-bound control binds to, in cases where the data source contains more than one distinct list of data items.(Inherited from DataBoundControl.)

System_CAPS_pubpropertyDataSource

Gets or sets the object from which the data-bound control retrieves its list of data items.(Inherited from BaseDataBoundControl.)

System_CAPS_pubpropertyDataSourceID

Gets or sets the ID of the control from which the data-bound control retrieves its list of data items.(Inherited from DataBoundControl.)

System_CAPS_pubpropertyDataSourceObject

Gets an object that implements the IDataSource interface, which provides access to the object's data content.(Inherited from DataBoundControl.)

System_CAPS_pubpropertyDataTextField

Gets or sets the field of the data source that provides the text content of the list items.(Inherited from ListControl.)

System_CAPS_pubpropertyDataTextFormatString

Gets or sets the formatting string used to control how data bound to the list control is displayed.(Inherited from ListControl.)

System_CAPS_pubpropertyDataValueField

Gets or sets the field of the data source that provides the value of each list item.(Inherited from ListControl.)

System_CAPS_protpropertyDesignMode

Gets a value indicating whether a control is being used on a design surface.(Inherited from Control.)

System_CAPS_pubpropertyEnabled

Gets or sets a value indicating whether the Web server control is enabled.(Inherited from WebControl.)

System_CAPS_pubpropertyEnableTheming

Gets or sets a value indicating whether themes apply to this control.(Inherited from WebControl.)

System_CAPS_pubpropertyEnableViewState

Gets or sets a value indicating whether the server control persists its view state, and the view state of any child controls it contains, to the requesting client.(Inherited from Control.)

System_CAPS_protpropertyEvents

Gets a list of event handler delegates for the control. This property is read-only.(Inherited from Control.)

System_CAPS_pubpropertyFont

Gets the font properties associated with the Web server control.(Inherited from WebControl.)

System_CAPS_pubpropertyForeColor

Gets or sets the foreground color (typically the color of the text) of the Web server control.(Inherited from WebControl.)

System_CAPS_pubpropertyHasAttributes

Gets a value indicating whether the control has attributes set.(Inherited from WebControl.)

System_CAPS_protpropertyHasChildViewState

Gets a value indicating whether the current server control's child controls have any saved view-state settings.(Inherited from Control.)

System_CAPS_pubpropertyHeight

Gets or sets the height of the Web server control.(Inherited from WebControl.)

System_CAPS_pubpropertyID

Gets or sets the programmatic identifier assigned to the server control.(Inherited from Control.)

System_CAPS_protpropertyIdSeparator

This API supports the product infrastructure and is not intended to be used directly from your code. Gets the character used to separate control identifiers.(Inherited from Control.)

System_CAPS_protpropertyInitialized

Gets a value indicating whether the data-bound control has been initialized.(Inherited from BaseDataBoundControl.)

System_CAPS_protpropertyIsBoundUsingDataSourceID

Gets a value indicating whether the DataSourceID property is set.(Inherited from BaseDataBoundControl.)

System_CAPS_protpropertyIsChildControlStateCleared

Gets a value indicating whether controls contained within this control have control state.(Inherited from Control.)

System_CAPS_protpropertyIsDataBindingAutomatic

Gets a value that indicates whether data binding is automatic.(Inherited from BaseDataBoundControl.)

System_CAPS_protpropertyIsEnabled

Gets a value indicating whether the control is enabled.(Inherited from WebControl.)

System_CAPS_protpropertyIsTrackingViewState

Gets a value that indicates whether the server control is saving changes to its view state.(Inherited from Control.)

System_CAPS_protpropertyIsUsingModelBinders

Gets a value that indicates whether model binding is in use.(Inherited from DataBoundControl.)

System_CAPS_protpropertyIsViewStateEnabled

Gets a value indicating whether view state is enabled for this control.(Inherited from Control.)

System_CAPS_pubpropertyItems

Gets the collection of items in the list control.(Inherited from ListControl.)

System_CAPS_pubpropertyItemType

Gets or sets the name of the data item type for strongly typed data binding.(Inherited from DataBoundControl.)

System_CAPS_protpropertyLoadViewStateByID

Gets a value indicating whether the control participates in loading its view state by ID instead of index. (Inherited from Control.)

System_CAPS_pubpropertyNamingContainer

Gets a reference to the server control's naming container, which creates a unique namespace for differentiating between server controls with the same Control::ID property value.(Inherited from Control.)

System_CAPS_pubpropertyPage

Gets a reference to the Page instance that contains the server control.(Inherited from Control.)

System_CAPS_pubpropertyParent

Gets a reference to the server control's parent control in the page control hierarchy.(Inherited from Control.)

System_CAPS_pubpropertyRenderingCompatibility

Gets a value that specifies the ASP.NET version that rendered HTML will be compatible with.(Inherited from Control.)

System_CAPS_protpropertyRequiresDataBinding

Gets or sets a value indicating whether the DataBind method should be called. (Inherited from BaseDataBoundControl.)

System_CAPS_protpropertySelectArguments

Gets a DataSourceSelectArguments object that the data-bound control uses when retrieving data from a data source control. (Inherited from DataBoundControl.)

System_CAPS_pubpropertySelectedIndex

Gets or sets the index of the selected item in the DropDownList control.(Overrides ListControl::SelectedIndex.)

System_CAPS_pubpropertySelectedItem

Gets the selected item with the lowest index in the list control.(Inherited from ListControl.)

System_CAPS_pubpropertySelectedValue

Gets the value of the selected item in the list control, or selects the item in the list control that contains the specified value.(Inherited from ListControl.)

System_CAPS_pubpropertySelectMethod

The name of the method to call in order to read data.(Inherited from DataBoundControl.)

System_CAPS_pubpropertySite

Gets information about the container that hosts the current control when rendered on a design surface.(Inherited from Control.)

System_CAPS_pubpropertySkinID

Gets or sets the skin to apply to the control.(Inherited from WebControl.)

System_CAPS_pubpropertyStyle

Gets a collection of text attributes that will be rendered as a style attribute on the outer tag of the Web server control.(Inherited from WebControl.)

System_CAPS_pubpropertySupportsDisabledAttribute

Gets a value that indicates whether the control should set the disabled attribute of the rendered HTML element to "disabled" when the control's IsEnabled property is false.(Overrides BaseDataBoundControl::SupportsDisabledAttribute.)

System_CAPS_pubpropertyTabIndex

Gets or sets the tab index of the Web server control.(Inherited from WebControl.)

System_CAPS_protpropertyTagKey

Gets the HtmlTextWriterTag value for the ListControl control. (Inherited from ListControl.)

System_CAPS_protpropertyTagName

Gets the name of the control tag. This property is used primarily by control developers.(Inherited from WebControl.)

System_CAPS_pubpropertyTemplateControl

Gets or sets a reference to the template that contains this control. (Inherited from Control.)

System_CAPS_pubpropertyTemplateSourceDirectory

Gets the virtual directory of the Page or UserControl that contains the current server control.(Inherited from Control.)

System_CAPS_pubpropertyText

Gets or sets the SelectedValue property of the ListControl control.(Inherited from ListControl.)

System_CAPS_pubpropertyToolTip

Gets or sets the text displayed when the mouse pointer hovers over the Web server control.(Inherited from WebControl.)

System_CAPS_pubpropertyUniqueID

Gets the unique, hierarchically qualified identifier for the server control.(Inherited from Control.)

System_CAPS_pubpropertyValidateRequestMode

Gets or sets a value that indicates whether the control checks client input from the browser for potentially dangerous values.(Inherited from Control.)

System_CAPS_pubpropertyValidationGroup

Gets or sets the group of controls for which the control that is derived from the ListControl class causes validation when it posts back to the server. (Inherited from ListControl.)

System_CAPS_protpropertyViewState

Gets a dictionary of state information that allows you to save and restore the view state of a server control across multiple requests for the same page.(Inherited from Control.)

System_CAPS_protpropertyViewStateIgnoresCase

Gets a value that indicates whether the StateBag object is case-insensitive.(Inherited from Control.)

System_CAPS_pubpropertyViewStateMode

Gets or sets the view-state mode of this control.(Inherited from Control.)

System_CAPS_pubpropertyVisible

Gets or sets a value that indicates whether a server control is rendered as UI on the page.(Inherited from Control.)

System_CAPS_pubpropertyWidth

Gets or sets the width of the Web server control.(Inherited from WebControl.)

NameDescription
System_CAPS_protmethodAddAttributesToRender(HtmlTextWriter^)

Adds HTML attributes and styles that need to be rendered to the specified HtmlTextWriter object.(Overrides ListControl::AddAttributesToRender(HtmlTextWriter^).)

System_CAPS_protmethodAddedControl(Control^, Int32)

Called after a child control is added to the Controls collection of the Control object.(Inherited from Control.)

System_CAPS_protmethodAddParsedSubObject(Object^)

Notifies the server control that an element, either XML or HTML, was parsed, and adds the element to the server control's ControlCollection object.(Inherited from Control.)

System_CAPS_pubmethodApplyStyle(Style^)

Copies any nonblank elements of the specified style to the Web control, overwriting any existing style elements of the control. This method is primarily used by control developers.(Inherited from WebControl.)

System_CAPS_pubmethodApplyStyleSheetSkin(Page^)

Applies the style properties defined in the page style sheet to the control.(Inherited from Control.)

System_CAPS_protmethodBeginRenderTracing(TextWriter^, Object^)

Begins design-time tracing of rendering data.(Inherited from Control.)

System_CAPS_protmethodBuildProfileTree(String^, Boolean)

This API supports the product infrastructure and is not intended to be used directly from your code. Gathers information about the server control and delivers it to the Trace property to be displayed when tracing is enabled for the page.(Inherited from Control.)

System_CAPS_protmethodClearCachedClientID()

This API supports the product infrastructure and is not intended to be used directly from your code. Sets the cached ClientID value to null.(Inherited from Control.)

System_CAPS_protmethodClearChildControlState()

Deletes the control-state information for the server control's child controls. (Inherited from Control.)

System_CAPS_protmethodClearChildState()

Deletes the view-state and control-state information for all the server control's child controls.(Inherited from Control.)

System_CAPS_protmethodClearChildViewState()

Deletes the view-state information for all the server control's child controls.(Inherited from Control.)

System_CAPS_protmethodClearEffectiveClientIDMode()

This API supports the product infrastructure and is not intended to be used directly from your code. Sets the ClientIDMode property of the current control instance and of any child controls to Inherit.(Inherited from Control.)

System_CAPS_pubmethodClearSelection()

Clears out the list selection and sets the Selected property of all items to false.(Inherited from ListControl.)

System_CAPS_protmethodConfirmInitState()

Sets the initialized state of the data-bound control.(Inherited from BaseDataBoundControl.)

System_CAPS_pubmethodCopyBaseAttributes(WebControl^)

Copies the properties not encapsulated by the Style object from the specified Web server control to the Web server control that this method is called from. This method is used primarily by control developers.(Inherited from WebControl.)

System_CAPS_protmethodCreateChildControls()

Called by the ASP.NET page framework to notify server controls that use composition-based implementation to create any child controls they contain in preparation for posting back or rendering.(Inherited from Control.)

System_CAPS_protmethodCreateControlCollection()

Creates a collection to store child controls.(Overrides Control::CreateControlCollection().)

System_CAPS_protmethodCreateControlStyle()

Creates the style object that is used internally by the WebControl class to implement all style related properties. This method is used primarily by control developers.(Inherited from WebControl.)

System_CAPS_protmethodCreateDataSourceSelectArguments()

Creates a default DataSourceSelectArguments object used by the data-bound control if no arguments are specified.(Inherited from DataBoundControl.)

System_CAPS_pubmethodDataBind()

Binds a data source to the invoked server control and all its child controls.(Inherited from BaseDataBoundControl.)

System_CAPS_protmethodDataBind(Boolean)

Binds a data source to the invoked server control and all its child controls with an option to raise the DataBinding event. (Inherited from Control.)

System_CAPS_protmethodDataBindChildren()

Binds a data source to the server control's child controls.(Inherited from Control.)

System_CAPS_pubmethodDispose()

Enables a server control to perform final clean up before it is released from memory.(Inherited from Control.)

System_CAPS_protmethodEndRenderTracing(TextWriter^, Object^)

Ends design-time tracing of rendering data.(Inherited from Control.)

System_CAPS_protmethodEnsureChildControls()

Determines whether the server control contains child controls. If it does not, it creates child controls.(Inherited from Control.)

System_CAPS_protmethodEnsureDataBound()

Calls the DataBind method if the DataSourceID property is set and the data-bound control is marked to require binding.(Inherited from BaseDataBoundControl.)

System_CAPS_protmethodEnsureID()

Creates an identifier for controls that do not have an identifier assigned.(Inherited from Control.)

System_CAPS_pubmethodEquals(Object^)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodFindControl(String^)

Searches the current naming container for a server control with the specified id parameter.(Inherited from Control.)

System_CAPS_protmethodFindControl(String^, Int32)

This API supports the product infrastructure and is not intended to be used directly from your code. Searches the current naming container for a server control with the specified id and an integer, specified in the pathOffset parameter, which aids in the search. You should not override this version of the FindControl method.(Inherited from Control.)

System_CAPS_pubmethodFocus()

Sets input focus to a control.(Inherited from Control.)

System_CAPS_protmethodGetData()

Retrieves a DataSourceView object that the data-bound control uses to perform data operations.(Inherited from DataBoundControl.)

System_CAPS_protmethodGetDataSource()

Retrieves the IDataSource interface that the data-bound control is associated with, if any.(Inherited from DataBoundControl.)

System_CAPS_protmethodGetDesignModeState()

This API supports the product infrastructure and is not intended to be used directly from your code. Gets design-time data for a control.(Inherited from Control.)

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetRouteUrl(Object^)

Gets the URL that corresponds to a set of route parameters.(Inherited from Control.)

System_CAPS_pubmethodGetRouteUrl(RouteValueDictionary^)

Gets the URL that corresponds to a set of route parameters.(Inherited from Control.)

System_CAPS_pubmethodGetRouteUrl(String^, Object^)

Gets the URL that corresponds to a set of route parameters and a route name.(Inherited from Control.)

System_CAPS_pubmethodGetRouteUrl(String^, RouteValueDictionary^)

Gets the URL that corresponds to a set of route parameters and a route name.(Inherited from Control.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethodGetUniqueIDRelativeTo(Control^)

Returns the prefixed portion of the UniqueID property of the specified control.(Inherited from Control.)

System_CAPS_pubmethodHasControls()

Determines if the server control contains any child controls.(Inherited from Control.)

System_CAPS_protmethodHasEvents()

Returns a value indicating whether events are registered for the control or any child controls.(Inherited from Control.)

System_CAPS_protmethodIsLiteralContent()

This API supports the product infrastructure and is not intended to be used directly from your code. Determines if the server control holds only literal content.(Inherited from Control.)

System_CAPS_protmethodLoadControlState(Object^)

Restores control-state information from a previous page request that was saved by the SaveControlState method.(Inherited from Control.)

System_CAPS_protmethodLoadPostData(String^, NameValueCollection^)

Processes postback data for the DropDownList control.

System_CAPS_protmethodLoadViewState(Object^)

Loads the previously saved view state of the DetailsView control.(Inherited from ListControl.)

System_CAPS_protmethodMapPathSecure(String^)

Retrieves the physical path that a virtual path, either absolute or relative, maps to.(Inherited from Control.)

System_CAPS_protmethodMarkAsDataBound()

Sets the state of the control in view state as successfully bound to data.(Inherited from DataBoundControl.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethodMergeStyle(Style^)

Copies any nonblank elements of the specified style to the Web control, but will not overwrite any existing style elements of the control. This method is used primarily by control developers.(Inherited from WebControl.)

System_CAPS_protmethodOnBubbleEvent(Object^, EventArgs^)

Determines whether the event for the server control is passed up the page's UI server control hierarchy.(Inherited from Control.)

System_CAPS_protmethodOnCreatingModelDataSource(CreatingModelDataSourceEventArgs^)

Raises the CreatingModelDataSource event.(Inherited from DataBoundControl.)

System_CAPS_protmethodOnDataBinding(EventArgs^)

This API supports the product infrastructure and is not intended to be used directly from your code. Raises the DataBinding event.(Inherited from ListControl.)

System_CAPS_protmethodOnDataBound(EventArgs^)

Raises the DataBound event.(Inherited from BaseDataBoundControl.)

System_CAPS_protmethodOnDataPropertyChanged()

Rebinds the data-bound control to its data after one of the base data source identification properties changes.(Inherited from DataBoundControl.)

System_CAPS_protmethodOnDataSourceViewChanged(Object^, EventArgs^)

Raises the DataSourceViewChanged event.(Inherited from DataBoundControl.)

System_CAPS_protmethodOnInit(EventArgs^)

Handles the Init event.(Inherited from BaseDataBoundControl.)

System_CAPS_protmethodOnLoad(EventArgs^)

Handles the Control::Load event.(Inherited from DataBoundControl.)

System_CAPS_protmethodOnPagePreLoad(Object^, EventArgs^)

Sets the initialized state of the data-bound control before the control is loaded.(Inherited from DataBoundControl.)

System_CAPS_protmethodOnPreRender(EventArgs^)

Raises the PreRender event.(Inherited from ListControl.)

System_CAPS_protmethodOnSelectedIndexChanged(EventArgs^)

Raises the SelectedIndexChanged event. This allows you to provide a custom handler for the event.(Inherited from ListControl.)

System_CAPS_protmethodOnTextChanged(EventArgs^)

Raises the TextChanged event.(Inherited from ListControl.)

System_CAPS_protmethodOnUnload(EventArgs^)

Raises the Unload event.(Inherited from Control.)

System_CAPS_protmethodOpenFile(String^)

Gets a Stream used to read a file.(Inherited from Control.)

System_CAPS_protmethodPerformDataBinding(IEnumerable^)

This API supports the product infrastructure and is not intended to be used directly from your code. Binds the specified data source to the control that is derived from the ListControl class.(Inherited from ListControl.)

System_CAPS_protmethodPerformSelect()

Retrieves data from the associated data source.(Inherited from ListControl.)

System_CAPS_protmethodRaiseBubbleEvent(Object^, EventArgs^)

Assigns any sources of the event and its information to the control's parent.(Inherited from Control.)

System_CAPS_protmethodRaisePostDataChangedEvent()

Raises events for the DropDownList control when postback occurs.

System_CAPS_protmethodRemovedControl(Control^)

Called after a child control is removed from the Controls collection of the Control object.(Inherited from Control.)

System_CAPS_protmethodRender(HtmlTextWriter^)

Renders the control to the specified HTML writer.(Inherited from WebControl.)

System_CAPS_pubmethodRenderBeginTag(HtmlTextWriter^)

Renders the HTML opening tag of the control to the specified writer. This method is used primarily by control developers.(Inherited from WebControl.)

System_CAPS_protmethodRenderChildren(HtmlTextWriter^)

Outputs the content of a server control's children to a provided HtmlTextWriter object, which writes the content to be rendered on the client.(Inherited from Control.)

System_CAPS_protmethodRenderContents(HtmlTextWriter^)

Renders the items in the ListControl control.(Inherited from ListControl.)

System_CAPS_pubmethodRenderControl(HtmlTextWriter^)

Outputs server control content to a provided HtmlTextWriter object and stores tracing information about the control if tracing is enabled.(Inherited from Control.)

System_CAPS_protmethodRenderControl(HtmlTextWriter^, ControlAdapter^)

Outputs server control content to a provided HtmlTextWriter object using a provided ControlAdapter object.(Inherited from Control.)

System_CAPS_pubmethodRenderEndTag(HtmlTextWriter^)

Renders the HTML closing tag of the control into the specified writer. This method is used primarily by control developers.(Inherited from WebControl.)

System_CAPS_protmethodResolveAdapter()

Gets the control adapter responsible for rendering the specified control.(Inherited from Control.)

System_CAPS_pubmethodResolveClientUrl(String^)

Gets a URL that can be used by the browser.(Inherited from Control.)

System_CAPS_pubmethodResolveUrl(String^)

Converts a URL into one that is usable on the requesting client.(Inherited from Control.)

System_CAPS_protmethodSaveControlState()

Saves any server control state changes that have occurred since the time the page was posted back to the server.(Inherited from Control.)

System_CAPS_protmethodSaveViewState()

Saves the current view state of the ListControl -derived control and the items it contains.(Inherited from ListControl.)

System_CAPS_protmethodSetDesignModeState(IDictionary^)

Sets design-time data for a control.(Inherited from Control.)

System_CAPS_protmethodSetPostDataSelection(Int32)

This API supports the product infrastructure and is not intended to be used directly from your code. Sets the Selected property of a ListItem control after a page is posted.(Inherited from ListControl.)

System_CAPS_pubmethodSetRenderMethodDelegate(RenderMethod^)

This API supports the product infrastructure and is not intended to be used directly from your code. Assigns an event handler delegate to render the server control and its content into its parent control.(Inherited from Control.)

System_CAPS_pubmethodSetTraceData(Object^, Object^)

Sets trace data for design-time tracing of rendering data, using the trace data key and the trace data value.(Inherited from Control.)

System_CAPS_pubmethodSetTraceData(Object^, Object^, Object^)

Sets trace data for design-time tracing of rendering data, using the traced object, the trace data key, and the trace data value.(Inherited from Control.)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_protmethodTrackViewState()

Marks the starting point to begin tracking and saving view-state changes to a ListControl -derived control.(Inherited from ListControl.)

System_CAPS_protmethodValidateDataSource(Object^)

Verifies that the object a data-bound control binds to is one it can work with.(Inherited from DataBoundControl.)

System_CAPS_protmethodVerifyMultiSelect()

Always throws an HttpException exception because multiple selection is not supported for the DropDownList control.(Overrides ListControl::VerifyMultiSelect().)

NameDescription
System_CAPS_pubeventCallingDataMethods

Occurs when data methods are being called.(Inherited from DataBoundControl.)

System_CAPS_pubeventCreatingModelDataSource

Occurs when the ModelDataSource object is being created.(Inherited from DataBoundControl.)

System_CAPS_pubeventDataBinding

Occurs when the server control binds to a data source.(Inherited from Control.)

System_CAPS_pubeventDataBound

Occurs after the server control binds to a data source.(Inherited from BaseDataBoundControl.)

System_CAPS_pubeventDisposed

Occurs when a server control is released from memory, which is the last stage of the server control lifecycle when an ASP.NET page is requested.(Inherited from Control.)

System_CAPS_pubeventInit

Occurs when the server control is initialized, which is the first step in its lifecycle.(Inherited from Control.)

System_CAPS_pubeventLoad

Occurs when the server control is loaded into the Page object.(Inherited from Control.)

System_CAPS_pubeventPreRender

Occurs after the Control object is loaded but prior to rendering.(Inherited from Control.)

System_CAPS_pubeventSelectedIndexChanged

Occurs when the selection from the list control changes between posts to the server.(Inherited from ListControl.)

System_CAPS_pubeventTextChanged

Occurs when the Text and SelectedValue properties change.(Inherited from ListControl.)

System_CAPS_pubeventUnload

Occurs when the server control is unloaded from memory.(Inherited from Control.)

NameDescription
System_CAPS_pubinterfaceSystem_CAPS_privmethodIAttributeAccessor::GetAttribute(String^)

This API supports the product infrastructure and is not intended to be used directly from your code. Gets an attribute of the Web control with the specified name.(Inherited from WebControl.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIAttributeAccessor::SetAttribute(String^, String^)

Sets an attribute of the Web control to the specified name and value.(Inherited from WebControl.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIControlDesignerAccessor::GetDesignModeState()

For a description of this member, see IControlDesignerAccessor::GetDesignModeState.(Inherited from Control.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIControlDesignerAccessor::SetDesignModeState(IDictionary^)

For a description of this member, see IControlDesignerAccessor::SetDesignModeState. (Inherited from Control.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIControlDesignerAccessor::SetOwnerControl(Control^)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IControlDesignerAccessor::SetOwnerControl. (Inherited from Control.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIParserAccessor::AddParsedSubObject(Object^)

For a description of this member, see IParserAccessor::AddParsedSubObject. (Inherited from Control.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIPostBackDataHandler::LoadPostData(String^, NameValueCollection^)

This API supports the product infrastructure and is not intended to be used directly from your code. Processes posted data for the DropDownList control.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIPostBackDataHandler::RaisePostDataChangedEvent()

This API supports the product infrastructure and is not intended to be used directly from your code. Raises events for the DropDownList control on postback.

System_CAPS_pubinterfaceSystem_CAPS_privpropertyIControlBuilderAccessor::ControlBuilder

For a description of this member, see IControlBuilderAccessor::ControlBuilder. (Inherited from Control.)

System_CAPS_pubinterfaceSystem_CAPS_privpropertyIControlDesignerAccessor::UserData

For a description of this member, see IControlDesignerAccessor::UserData. (Inherited from Control.)

System_CAPS_pubinterfaceSystem_CAPS_privpropertyIDataBindingsAccessor::DataBindings

For a description of this member, see IDataBindingsAccessor::DataBindings. (Inherited from Control.)

System_CAPS_pubinterfaceSystem_CAPS_privpropertyIDataBindingsAccessor::HasDataBindings

For a description of this member, see IDataBindingsAccessor::HasDataBindings. (Inherited from Control.)

System_CAPS_pubinterfaceSystem_CAPS_privpropertyIExpressionsAccessor::Expressions

For a description of this member, see IExpressionsAccessor::Expressions. (Inherited from Control.)

System_CAPS_pubinterfaceSystem_CAPS_privpropertyIExpressionsAccessor::HasExpressions

For a description of this member, see IExpressionsAccessor::HasExpressions. (Inherited from Control.)

NameDescription
System_CAPS_pubmethodEnablePersistedSelection()

Obsolete.Enables selection to be persisted in data controls that support selection and paging.(Defined by DynamicDataExtensions.)

System_CAPS_pubmethodFindDataSourceControl()

Returns the data source that is associated with the data control for the specified control.(Defined by DynamicDataExtensions.)

System_CAPS_pubmethodFindFieldTemplate(String^)

Returns the field template for the specified column in the specified control's naming container.(Defined by DynamicDataExtensions.)

System_CAPS_pubmethodFindMetaTable()

Returns the metatable object for the containing data control.(Defined by DynamicDataExtensions.)

Use the DropDownList control to create a single-selection drop-down list control. You can control the appearance of the DropDownList control by setting the BorderColor, BorderStyle, and BorderWidth properties.

To specify the items that you want to appear in the DropDownList control, place a ListItem object for each entry between the opening and closing tags of the DropDownList control.

The DropDownList control also supports data binding. To bind the control to a data source, create a data source, such as a System.Collections::ArrayList object, that contains the items to display in the control. Then, use the Control::DataBind method to bind the data source to the DropDownList control.

Use the SelectedIndex property to programmatically determine the index of the item selected by the user from the DropDownList control. The index can then be used to retrieve the selected item from the Items collection of the control.

For information about how to configure this control so that it generates markup that conforms to accessibility standards, see Accessibility in Visual Studio and ASP.NET and ASP.NET Controls and Accessibility.

<asp:DropDownList
    AccessKey="string"
    AppendDataBoundItems="True|False"
    AutoPostBack="True|False"
    BackColor="color name|#dddddd"
    BorderColor="color name|#dddddd"
    BorderStyle="NotSet|None|Dotted|Dashed|Solid|Double|Groove|Ridge|
        Inset|Outset"
    BorderWidth="size"
    CausesValidation="True|False"
    CssClass="string"
    DataMember="string"
    DataSource="string"
    DataSourceID="string"
    DataTextField="string"
    DataTextFormatString="string"
    DataValueField="string"
    Enabled="True|False"
    EnableTheming="True|False"
    EnableViewState="True|False"
    Font-Bold="True|False"
    Font-Italic="True|False"
    Font-Names="string"
    Font-Overline="True|False"
    Font-Size="string|Smaller|Larger|XX-Small|X-Small|Small|Medium|
        Large|X-Large|XX-Large"
    Font-Strikeout="True|False"
    Font-Underline="True|False"
    ForeColor="color name|#dddddd"
    Height="size"
    ID="string"
    OnDataBinding="DataBinding event handler"
    OnDataBound="DataBound event handler"
    OnDisposed="Disposed event handler"
    OnInit="Init event handler"
    OnLoad="Load event handler"
    OnPreRender="PreRender event handler"
    OnSelectedIndexChanged="SelectedIndexChanged event handler"
    OnTextChanged="TextChanged event handler"
    OnUnload="Unload event handler"
    runat="server"
    SelectedIndex="integer"
    SelectedValue="string"
    SkinID="string"
    Style="string"
    TabIndex="integer"
    ToolTip="string"
    ValidationGroup="string"
    Visible="True|False"
    Width="size"
>
            <asp:ListItem
                Enabled="True|False"
                Selected="True|False"
                Text="string"
                Value="string"
            />
</asp:DropDownList>

A Visual Studio Web site project with source code is available to accompany this topic: Download.

The following code example demonstrates how to create a DropDownList control that contains four items.

No code example is currently available or this language may not be supported.

The following code example demonstrates how to create a DropDownList control though data binding.

No code example is currently available or this language may not be supported.

.NET Framework
Available since 1.1

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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