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ToolStripDropDown.Closing Event

Occurs when the ToolStripDropDown control is about to close.

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

public event ToolStripDropDownClosingEventHandler Closing

For more information about handling events, see Consuming Events.

The following code example demonstrates how to selectively close a ToolStripDropDown control by handling the Closing event

// This method handles the Closing event. The ToolStripDropDown 
// control is not allowed to close unless the Done menu item 
// is clicked or the Close method is called explicitly. 
// The Done menu item is enabled only after both of the other 
// menu items have been selected. 
private void contextMenuStrip_Closing(
    object sender, 
    ToolStripDropDownClosingEventArgs e)
{
    if (e.CloseReason != ToolStripDropDownCloseReason.CloseCalled)
    {
        if (subItem1ToolStripMenuItem.Checked &&
            subItem2ToolStripMenuItem.Checked &&
            doneToolStripMenuItem.Enabled)
        {
            // Reset the state of menu items.
            subItem1ToolStripMenuItem.Checked = false;
            subItem2ToolStripMenuItem.Checked = false;
            doneToolStripMenuItem.Enabled = false;

            // Allow the ToolStripDropDown to close. 
            // Don't cancel the Close operation.
            e.Cancel = false;
        }
        else
        {
            // Cancel the Close operation to keep the menu open.
            e.Cancel = true;
            this.toolStripStatusLabel1.Text = "Close canceled";
        }
    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0

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