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ParentControlDesigner.OnMouseDragBegin Method

Called in response to the left mouse button being pressed and held while over the component.

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

protected override void OnMouseDragBegin(
	int x,
	int y


Type: System.Int32

The x-coordinate of the mouse in screen coordinates.

Type: System.Int32

The y-coordinate of the mouse in screen coordinates.

This method is called in response to the left mouse button being pressed on a component. The designer overrides the base form of this method to provide a "lasso" selection mechanism for components within the control.


You can pass a point in screen coordinates to the PointToClient method of the Control class to obtain the coordinates of the point relative to the upper-left corner of the control.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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