ToolStripDropDown.Closing Event

public:
 event System::Windows::Forms::ToolStripDropDownClosingEventHandler ^ Closing;

public event System.Windows.Forms.ToolStripDropDownClosingEventHandler Closing;

public event System.Windows.Forms.ToolStripDropDownClosingEventHandler? Closing;

member this.Closing : System.Windows.Forms.ToolStripDropDownClosingEventHandler 

Public Custom Event Closing As ToolStripDropDownClosingEventHandler 

Event Type

Examples

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";
 }
 }
}

' 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
 Else
 ' Cancel the Close operation to keep the menu open.
 e.Cancel = True
 Me.toolStripStatusLabel1.Text = "Close canceled"
 End If
 End If
 End Sub

Remarks

For more information about handling events, see Handling and Raising Events.