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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 Closing As ToolStripDropDownClosingEventHandler

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 Sub contextMenuStrip_Closing(sender As Object, e As ToolStripDropDownClosingEventArgs) Handles contextMenuStrip1.Closing
   If e.CloseReason <> ToolStripDropDownCloseReason.CloseCalled Then
      If subItem1ToolStripMenuItem.Checked AndAlso subItem2ToolStripMenuItem.Checked AndAlso doneToolStripMenuItem.Enabled Then
         ' 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
         ' Cancel the Close operation to keep the menu open.
         e.Cancel = True
         Me.toolStripStatusLabel1.Text = "Close canceled"
      End If
   End If
 End Sub

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.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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