MessageBox in C#.NET Web application

I would like to do something like the following in a C#.Net web application. I would like to popup a message box with OK and Cancel button. Based on what the user clicks I would like to

 if (System.Windows.Forms.MessageBox.Show("The Mapping will be deleted permanently. Press OK to Continue.", "FirstDeal Warning", System.Windows.Forms.MessageBoxButtons.OKCancel, System.Windows.Forms.MessageBoxIcon.Question) == System.Windows.Forms.DialogResult.OK)
                {
// if ok do something
}
Start Free Trial