| Class | Description |
| AccessibleObject | Provides information that accessibility applications use to adjust an application's UI for users with impairments. |
| AmbientProperties | Provides ambient property values to top-level controls. |
| Application | Provides static (Shared in Visual Basic) methods and properties to manage an application, such as methods to start and stop an application, to process Windows messages, and properties to get information about an application. This class cannot be inherited. |
| ApplicationContext | Specifies the contextual information about an application thread. |
| AxHost | Wraps ActiveX controls and exposes them as fully featured Windows Forms controls. |
| AxHost.InvalidActiveXStateException | The exception that is thrown when the ActiveX control is referenced while in an invalid state. |
| AxHost.State | Encapsulates the persisted state of an ActiveX control. |
| BaseCollection | Provides the base functionality for creating data-related collections in the System.Windows.Forms namespace. |
| Binding | Represents the simple binding between the property value of an object and the property value of a control. |
| BindingContext | Manages the collection of BindingManagerBase objects for any object that inherits from the Control class. |
| BindingManagerBase | Manages all Binding objects that are bound to the same data source and data member. This class is abstract. |
| BindingsCollection | Represents a collection of Binding objects for a control. |
| Button | Represents a Windows button control. |
| ButtonBase | Implements the basic functionality common to button controls. |
| CheckBox | Represents a Windows check box. |
| CheckedListBox | Displays a ListBox in which a check box is displayed to the left of each item. |
CheckedListBox.
CheckedIndexCollection | Encapsulates the collection of indexes of checked items (including items in an indeterminate state) in a CheckedListBox. |
CheckedListBox.
CheckedItemCollection | Encapsulates the collection of checked items (including items in an indeterminate state) in a CheckedListBox control. |
| CheckedListBox.ObjectCollection | Represents the collection of items in a CheckedListBox. |
| Clipboard | Provides methods to place data on and retrieve data from the system clipboard. This class cannot be inherited. |
| ColorDialog | Represents a common dialog box that displays available colors along with controls that allow the user to define custom colors. |
| ColumnClickEventArgs | Provides data for the ColumnClick event. |
| ColumnHeader | Displays a single column header in a ListView control. |
| ComboBox | Represents a Windows combo box control. |
| ComboBox.ObjectCollection | Represents the collection of items in a ComboBox. |
| CommonDialog | Specifies the base class used for displaying dialog boxes on the screen. |
| ContainerControl | Provides focus management functionality for controls that can function as a container for other controls. |
| ContentsResizedEventArgs | Provides data for the ContentsResized event. |
| ContextMenu | Represents a shortcut menu. |
| Control | Defines the base class for controls, which are components with visual representation. |
| Control.ControlAccessibleObject | Provides information about a control that can be used by an accessibility application. |
| Control.ControlCollection | Represents a collection of Control objects |
| ControlBindingsCollection | Represents the collection of data bindings for a control. |
| ControlEventArgs | Provides data for the ControlAdded and ControlRemoved events. |
| ControlPaint | Provides methods used to paint common Windows controls and their elements. |
| ConvertEventArgs | Provides data for the Format and Parse events. |
| CreateParams | Encapsulates the information needed when creating a control. |
| CurrencyManager | Manages a list of Binding objects. |
| Cursor | Represents the image used to paint the mouse pointer. |
| CursorConverter | Provides a type converter to convert Cursor objects to and from various other representations. |
| Cursors | Provides a collection of Cursor objects for use by a Windows Forms application. |
| DataFormats | Provides static (Shared in Visual Basic), predefined Clipboard format names. Use them to identify the format of data that you store in an IDataObject. |
| DataFormats.Format | Represents a clipboard format type. |
| DataGrid | Displays ADO.NET data in a scrollable grid. |
| DataGrid.HitTestInfo | Contains information about a part of the System.Windows.Forms.DataGrid at a specified coordinate. This class cannot be inherited. |
| DataGridBoolColumn | Specifies a column in which each cell contains a check box for representing a Boolean value. |
| DataGridColumnStyle | Specifies the appearance and text formatting and behavior of a System.Windows.Forms.DataGrid control column. This class is abstract. |
| DataGridPreferredColumnWidthTypeConverter | Converts the value of an object to a different data type. |
| DataGridTableStyle | Represents the table drawn by the System.Windows.Forms.DataGrid control at run time. |
| DataGridTextBox | Represents a TextBox control that is hosted in a DataGridTextBoxColumn. |
| DataGridTextBoxColumn | Hosts a TextBox control in a cell of a DataGridColumnStyle for editing strings. |
| DataObject | Implements a basic data transfer mechanism. |
| DateRangeEventArgs | Provides data for the DateChanged or DateSelected events of the MonthCalendar control. |
| DateTimePicker | Represents a Windows date/time picker control. |
| DomainUpDown | Represents a Windows up-down control that displays string values. |
DomainUpDown.
DomainUpDownItemCollection | Encapsulates a collection of objects for use by the DomainUpDown class. |
| DragEventArgs | Provides data for the DragDrop, DragEnter, or DragOver event. |
| DrawItemEventArgs | Provides data for the DrawItem event. |
| ErrorProvider | Provides a user interface for indicating that a control on a form has an error associated with it. |
| FeatureSupport | Provides static (Shared in Visual Basic) methods for retrieving feature information from the current system. |
| FileDialog | Displays a dialog box from which the user can select a file. |
| FolderBrowserDialog | Represents a common dialog box that allows the user to choose a folder. This class cannot be inherited. |
| FontDialog | Represents a common dialog box that displays a list of fonts that are currently installed on the system. |
| Form | Represents a window or dialog box that makes up an application's user interface. |
| Form.ControlCollection | Represents a collection of controls on the form. |
| GiveFeedbackEventArgs | Provides data for the GiveFeedback event, which occurs during a drag operation. |
| GridColumnStylesCollection | Represents a collection of DataGridColumnStyle objects in the System.Windows.Forms.DataGrid control. |
| GridItem | Implements one row in a PropertyGrid. |
| GridItemCollection | Contains a collection of GridItem objects. |
| GridTableStylesCollection | Represents a collection of DataGridTableStyle objects in the DataGrid control. |
| GroupBox | Represents a Windows group box. |
| Help | Encapsulates the HTML Help 1.0 engine. |
| HelpEventArgs | Provides data for the HelpRequested event. |
| HelpProvider | Provides pop-up or online Help for controls. |
| HScrollBar | Represents a standard Windows horizontal scroll bar. |
| ImageIndexConverter | Provides a type converter to convert data for an image index to and from a string. |
| ImageList | Provides methods to manage a collection of Image objects. This class cannot be inherited. |
| ImageList.ImageCollection | Encapsulates the collection of Image objects in an ImageList. |
| ImageListStreamer | Provides the data portion of an ImageList. |
| InputLanguage | Provides methods and fields to manage the input language. This class cannot be inherited. |
| InputLanguageChangedEventArgs | Provides data for the InputLanguageChanged event. |
| InputLanguageChangingEventArgs | Provides data for the InputLanguageChanging event. |
| InputLanguageCollection | Stores InputLanguage objects. |
| InvalidateEventArgs | Provides data for the Invalidated event. |
| ItemChangedEventArgs | Provides data for the ItemChanged event. |
| ItemCheckEventArgs | Provides data for the ItemCheck event of the CheckedListBox and ListView controls. |
| ItemDragEventArgs | Provides data for the ItemDrag event of the ListView and TreeView controls. |
| KeyEventArgs | Provides data for the KeyDown or KeyUp event. |
| KeyPressEventArgs | Provides data for the KeyPress event. |
| KeysConverter | Provides a TypeConverter to convert Keys objects to and from other representations. |
| Label | Represents a standard Windows label. |
| LabelEditEventArgs | Provides data for the LabelEdit event. |
| LayoutEventArgs | Provides data for the Layout event. |
| LinkArea.LinkAreaConverter | Provides a type converter to convert LinkArea.LinkAreaConverter objects to and from various other representations. |
| LinkClickedEventArgs | Provides data for the LinkClicked event. |
| LinkLabel | Represents a Windows label control that can display hyperlinks. |
| LinkLabel.Link | Represents a link within a LinkLabel control. |
| LinkLabel.LinkCollection | Represents the collection of links within a LinkLabel control. |
| LinkLabelLinkClickedEventArgs | Provides data for the LinkClicked event. |
| ListBindingConverter | Provides a type converter to convert Binding objects to and from various other representations. |
| ListBox | Represents a Windows list box control. |
| ListBox.ObjectCollection | Represents the collection of items in a ListBox. |
| ListBox.SelectedIndexCollection | Represents the collection containing the indexes to the selected items in a ListBox. |
| ListBox.SelectedObjectCollection | Represents the collection of selected items in the ListBox. |
| ListControl | Provides a common implementation of members for the ListBox and ComboBox classes. |
| ListView | Represents a Windows list view control, which displays a collection of items that can be displayed using one of four different views. |
| ListView.CheckedIndexCollection | Represents the collection containing the indexes to the checked items in a list view control. |
ListView.
CheckedListViewItemCollection | Represents the collection of checked items in a list view control. |
| ListView.ColumnHeaderCollection | Represents the collection of column headers in a ListView control. |
| ListView.ListViewItemCollection | Represents the collection of items in a ListView control. |
| ListView.SelectedIndexCollection | Represents the collection containing the indexes to the selected items in a list view control. |
ListView.
SelectedListViewItemCollection | Represents the collection of selected items in a list view control. |
| ListViewItem | Represents an item in a ListView control. |
| ListViewItem.ListViewSubItem | Represents a subitem of a ListViewItem. |
ListViewItem.
ListViewSubItemCollection | Represents a collection of ListViewItem.ListViewSubItem objects stored in a ListViewItem. |
| ListViewItemConverter | Provides a type converter to convert ListViewItem objects to and from various other representations. |
| MainMenu | Represents the menu structure of a form. |
| MeasureItemEventArgs | Provides data for the MeasureItem event of the ListBox, ComboBox, CheckedListBox, and MenuItem controls. |
| Menu | Represents the base functionality for all menus. |
| Menu.MenuItemCollection | Represents a collection of MenuItem objects. |
| MenuItem | Represents an individual item that is displayed within a MainMenu or ContextMenu. |
| MessageBox | Displays a message box that can contain text, buttons, and symbols that inform and instruct the user. |
| MonthCalendar | Represents a standard Windows month calendar control. |
| MonthCalendar.HitTestInfo | Contains information about an area of a MonthCalendar control. This class cannot be inherited. |
| MouseEventArgs | Provides data for the MouseUp, MouseDown, and MouseMove events. |
| NativeWindow | Provides a low-level encapsulation of a window handle and a window procedure. |
| NavigateEventArgs | Provides data for the Navigate event. |
| NodeLabelEditEventArgs | Provides data for the BeforeLabelEdit and AfterLabelEdit events. |
| NotifyIcon | Specifies a component that creates an icon in the status area. This class cannot be inherited. |
| NumericUpDown | Represents a Windows up-down control that displays numeric values. |
| OpacityConverter | Provides a type converter to convert opacity values to and from a string. |
| OpenFileDialog | Represents a common dialog box that displays the control that allows the user to open a file. This class cannot be inherited. |
| OSFeature | Provides operating-system specific feature queries. |
| PageSetupDialog | Represents a dialog box that allows users to manipulate page settings, including margins and paper orientation. |
| PaintEventArgs | Provides data for the Paint event. |
| Panel | Represents a Windows Panel control. |
| PictureBox | Represents a Windows picture box control for displaying an image. |
| PrintControllerWithStatusDialog | Controls how a document is printed. |
| PrintDialog | Allows users to select a printer and choose which portions of the document to print. |
| PrintPreviewControl | Represents the raw "preview" part of print previewing, without any dialog boxes or buttons. Most PrintPreviewControl objects are found on PrintPreviewDialog objects, but they do not have to be. |
| PrintPreviewDialog | Represents a dialog box form that contains a PrintPreviewControl. |
| ProgressBar | Represents a Windows progress bar control. |
| PropertyGrid | Provides a user interface for browsing the properties of an object. |
| PropertyGrid.PropertyTabCollection | Contains a collection of PropertyTab objects. |
| PropertyManager | Maintains a Binding between an object's property and a data-bound control property. |
| PropertyTabChangedEventArgs | Provides data for the PropertyTabChanged event of a PropertyGrid. |
| PropertyValueChangedEventArgs | Provides data for the PropertyValueChanged event of a PropertyGrid. |
| QueryAccessibilityHelpEventArgs | Provides data for the QueryAccessibilityHelp event. |
| QueryContinueDragEventArgs | Provides data for the QueryContinueDrag event. |
| RadioButton | Represents a Windows radio button. |
| RichTextBox | Represents a Windows rich text box control. |
| SaveFileDialog | Represents a common dialog box that allows the user to specify options for saving a file. This class cannot be inherited. |
| Screen | Represents a display device or multiple display devices on a single system. |
| ScrollableControl | Defines a base class for controls that support auto-scrolling behavior. |
| ScrollableControl.DockPaddingEdges | Determines the border padding for docked controls. |
| ScrollBar | Implements the basic functionality of a scroll bar control. |
| ScrollEventArgs | Provides data for the Scroll event. |
| SelectedGridItemChangedEventArgs | Provides data for the SelectedGridItemChanged event of the PropertyGrid control. |
| SelectionRange | Represents a date selection range in a month calendar control. |
| SelectionRangeConverter | Provides a type converter to convert SelectionRange objects to and from various other representations. |
| SendKeys | Provides methods for sending keystrokes to an application. |
| Splitter | Represents a splitter control that allows the user to resize docked controls. |
| SplitterEventArgs | Provides data for SplitterMoving and the SplitterMoved events. |
| StatusBar | Represents a Windows status bar control. |
| StatusBar.StatusBarPanelCollection | Represents the collection of panels in a StatusBar control. |
| StatusBarDrawItemEventArgs | Provides data for the DrawItem event. |
| StatusBarPanel | Represents a panel in a StatusBar control. |
| StatusBarPanelClickEventArgs | Provides data for the PanelClick event. |
| SystemInformation | Provides information about the operating system. |
| TabControl | Manages a related set of tab pages. |
| TabControl.ControlCollection | Contains a collection of Control objects. |
| TabControl.TabPageCollection | Contains a collection of TabPage objects. |
| TabPage | Represents a single tab page in a TabControl. |
| TabPage.TabPageControlCollection | Contains the collection of controls that the TabPage uses. |
| TextBox | Represents a Windows text box control. |
| TextBoxBase | Implements the basic functionality required by text controls. |
| Timer | Implements a timer that raises an event at user-defined intervals. This timer is optimized for use in Windows Forms applications and must be used in a window. |
| ToolBar | Represents a Windows toolbar. |
| ToolBar.ToolBarButtonCollection | Encapsulates a collection of ToolBarButton controls for use by the ToolBar class. |
| ToolBarButton | Represents a Windows toolbar button. |
| ToolBarButtonClickEventArgs | Provides data for the ButtonClick event. |
| ToolTip | Represents a small rectangular pop-up window that displays a brief description of a control's purpose when the mouse hovers over the control. |
| TrackBar | Represents a standard Windows track bar. |
| TreeNode | Represents a node of a TreeView. |
| TreeNodeCollection | Represents a collection of TreeNode objects. |
| TreeNodeConverter | Provides a type converter to convert TreeNode objects to and from various other representations. |
| TreeView | Displays a hierarchical collection of labeled items, each represented by a TreeNode. |
| TreeViewCancelEventArgs | Provides data for the BeforeCheck, BeforeCollapse, BeforeExpand, or BeforeSelect events of a TreeView control. |
| TreeViewEventArgs | Provides data for the AfterCheck, AfterCollapse, AfterExpand, or AfterSelect events of a TreeView control. |
| TreeViewImageIndexConverter | Provides a type converter to convert data for an image index to and from one data type to another for use by the TreeView control. |
| UICuesEventArgs | Provides data for the ChangeUICues event. |
| UpDownBase | Implements the basic functionality required by an up-down control. |
| UserControl | Provides an empty control that can be used to create other controls. |
| VScrollBar | Represents a standard Windows vertical scroll bar. |