using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; public class Test{ [STAThread] static void Main() { DialogResult reply = MessageBox.Show("Question?", "Yes or No Demo",MessageBoxButtons.YesNo,MessageBoxIcon.Question); if (reply == DialogResult.Yes){ MessageBox.Show("Yes"); } else { MessageBox.Show("No"); } } }