Window.Close Method


Manually closes a Window.

 void Close();
public void Close ();
public void Close ();
member this.Close : unit -> unit
member this.Close : unit -> unit
Public Sub Close ()


The following example shows a File > Exit menu being handled to explicitly call Close.

<MenuItem Name="fileExitMenuItem" Header="E_xit" Click="fileExitMenuItem_Click"></MenuItem>
void fileExitMenuItem_Click(object sender, RoutedEventArgs e)
    // Close this window
Private Sub fileExitMenuItem_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
    ' Close this window
End Sub


A Window can be closed using one of several, well-known, system-provided mechanisms located in its title bar, including:

  • ALT+F4.
  • System menu | Close.
  • Close button.

A Window can also be closed using one of several well-known mechanisms within the client area that are provided by developers, including:

  • File > Exit on a main window.
  • File > Close or a Close button on a child window.


OK and Cancel buttons on a dialog box are also developer-provided, although will likely set DialogResult, which automatically closes a window that was opened by calling ShowDialog.

These mechanisms require you to explicitly call Close to close a window.


If a window, opened by calling ShowDialog, and with a Button with its IsCancel property set to true, will automatically close when the button is either clicked, or ESC is pressed. If the window was opened using Show, however, Close must be explicitly called, such as from Click event handler for the Button.

Closing a window causes the Closing event to be raised. If the Closing event isn't canceled, the following occurs:


This method cannot be called when a window is hosted in a browser.

Applies to

See also