Windows desktop applications
Collapse the table of content
Expand the table of content
Information
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

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
/** @event */
public void add_Closing (ToolStripDropDownClosingEventHandler value)

/** @event */
public void remove_Closing (ToolStripDropDownClosingEventHandler value)

In JScript, you can handle the events defined by a class, but you cannot define your own.
Not applicable.

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 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

Community Additions

Show:
© 2016 Microsoft