DataGridViewCellEventHandler Delegate
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DataGridViewCellEventHandler Delegate


Represents the method that will handle DataGridView events related to cell and row operations.

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

public delegate void DataGridViewCellEventHandler(
	object sender,
	DataGridViewCellEventArgs e


Type: System.Object

The source of the event.

Type: System.Windows.Forms.DataGridViewCellEventArgs

A DataGridViewCellEventArgs that contains the event data.

DataGridViewCellEventHandler handles the following DataGridView events:

When you create a DataGridViewCellEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event-handler delegates, see NIB: Events and Delegates.

The following code example demonstrates using CellMouseEnter and CellMouseLeave event handlers to determine whether a cell can be clicked. The example updates each ToolTipText to advertise the current image layout. This code is part of a larger example shown in How to: Work with Image Columns in the Windows Forms DataGridView Control.

private void dataGridView1_CellMouseEnter(object sender,
    DataGridViewCellEventArgs e)
    Bitmap markingUnderMouse = (Bitmap)dataGridView1.

    if (markingUnderMouse == blank)
        dataGridView1.Cursor = Cursors.Default;
    else if (markingUnderMouse == o || markingUnderMouse == x)
        dataGridView1.Cursor = Cursors.No;
        ToolTip(e, true);

private void ToolTip(DataGridViewCellEventArgs e, bool showTip)
    DataGridViewImageCell cell = (DataGridViewImageCell)
    DataGridViewImageColumn imageColumn =

    if (showTip) cell.ToolTipText = imageColumn.Description;
    else { cell.ToolTipText = String.Empty; }

private void dataGridView1_CellMouseLeave(object sender,
    DataGridViewCellEventArgs e)
    ToolTip(e, false);
    dataGridView1.Cursor = Cursors.Default;

.NET Framework
Available since 2.0
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