You must attach the event handlers to the ThreadExit event to perform any unhandled, required tasks before the thread stops running. Close files opened by this thread, or dispose of objects that the garbage collector did not reclaim.

Caution
Because this is a static event, you must detach your event handlers when your application is disposed, or memory leaks will result.

The following code example demonstrates the use of this member. In the example, an event handler reports on the occurrence of the ThreadExit event. This report helps you to learn when the event occurs and can assist you in debugging. To report on multiple events or on events that occur frequently, consider replacing MessageBox..::.Show with Console..::.WriteLine or appending the message to a multiline TextBox.

To run the example code, paste it into a Windows Forms and ensure that the event handler is associated with the ThreadExit event.

Private Sub Application_ThreadExit(ByVal sender As Object, ByVal e As EventArgs) 

    MessageBox.Show("You are in the Application.ThreadExit event.")

End Sub

private void Application_ThreadExit(Object sender, EventArgs e) {

   MessageBox.Show("You are in the Application.ThreadExit event.");

}

.NET Framework

.NET Framework Client Profile

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

Reference