How to catch the event of the window close button(red X button on window right top corner) in wpf form?

Question

How can I catch the event of the window close button(red X button on window right top corner) in a WPF form? We have got the closing event, window unloaded event also, but w

Answer 1

at form1.Designer.cs put below code to assign the event

this.Closing += Window_Closing;

at form1.cs put the closing function

private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
    //change the event to avoid close form
    e.Cancel = true;
}