Form can not be achieved? Why is this?

[jlynet]

public partial class MainWindow : Form
.....
Toast.Toast myToast = new Toast.Toast();
// myToast.Name = "myToast";
// myToast.Content = "Copy success!";
// myToast.DurationToast = Toast.Toast.ToastDuration.Long;
// myToast.Show();

						Toast.Toast myToast = new Toast.Toast();
						myToast.Name = "myToast";
						myToast.DurationToast = Toast.Toast.ToastDuration.Long;
						myToast.Message = "Copy success!";
						myToast.Duration = TimeSpan.FromSeconds(2);
						myToast.DurationAnimation = TimeSpan.FromMilliseconds(300);
						myToast.Show();

.....