OnMouseDown Method
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DataGrid.OnMouseDown Method

Raises the MouseDown event.

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

protected override void OnMouseDown(
	MouseEventArgs e


Type: System.Windows.Forms.MouseEventArgs
A MouseEventArgs that contains data about the OnMouseDown event.

Raising an event invokes the event handler through a delegate. For an overview, see Raising an Event.

Notes to Inheritors

When overriding OnMouseDown in a derived class, be sure to call the base class's OnMouseDown method.

The following code example demonstrates the use of this member.

public class MyDataGrid : DataGrid 
    // Override the OnMouseDown event to select the whole row
    // when the user clicks anywhere on a row.
    protected override void OnMouseDown(MouseEventArgs e) 
        // Get the HitTestInfo to return the row and pass
        // that value to the IsSelected property of the DataGrid.
        DataGrid.HitTestInfo hit = this.HitTest(e.X, e.Y);
        if (hit.Row < 0)
        if (this.IsSelected(hit.Row))

.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.

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