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 we want to show a pop up if he clicks the close button of the WPF form.

Answer 1

Use the Closing event in the Window, you can handle it like this to prevent it from closing:

private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
    e.Cancel = true;
}