private void Common_Click(object sender, RoutedEventArgs e) { if (sender == AsyncBtn) { AsyncWindow asyncWindow = new AsyncWindow(); asyncWindow.Show(); this.Close(); } else if (sender == NetworkBtn) { NetworkWindow netWindow = new NetworkWindow(); netWindow.Show(); this.Close(); } else if (sender == ParallelBtn) { ParallelWindow parallelWindow = new ParallelWindow(); parallelWindow.Show(); this.Close(); } }