showmessage in .net?

[Luckie]

Code:

void Button1Click(object sender, System.EventArgs e)
        {
            DialogResult MBAnswer;
            MBAnswer = MessageBox.Show("Hello world.", "Test", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
            switch(MBAnswer) {
                case DialogResult.Yes:
                    Application.Exit();
                    break;
                case DialogResult.No:
                    Bar(5);
                    Foo("abgebrochen");
                    break;
            }
        }