C# 中的訊息框

using System.Windows.Forms;

namespace messagbox {
  static class Program {
    static void Main() {
      Application.EnableVisualStyles();
      DialogResult dr = MessageBox.Show("Are you happy now?", "Mood Test", MessageBoxButtons.YesNo);
      switch (dr) {
        case DialogResult.Yes:
          MessageBox.Show("That is Fantastic");
          break;
        case DialogResult.No:
          MessageBox.Show("Why Not?");
          break;
      }
    }
  }
}