Question

With this the default is OK. Can I make the default Cancel?

   MessageBoxResult result = MessageBox.Show
      (message, caption, MessageBoxButton.OKCancel);

Answer 1

Use this overload, which allows you to specify the default MessageBoxResult:

MessageBoxResult result = MessageBox.Show
    (message, caption, MessageBoxButton.OKCancel,  
        MessageBoxImage.Information, MessageBoxResult.Cancel);