Title: Set the MessageBox default button in C#

The fifth parameter to MessageBox.Show indicates the default button. The following code shows how the program displays a MessageBox with the second button as the default so it is initially selected when the message box appears.

// Display a message box with the second button the default. private void btnButton2_Click(object sender, EventArgs e) { DialogResult result = MessageBox.Show( "The second button is the default.", "Caption", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Information, MessageBoxDefaultButton.Button2); MessageBox.Show("You selected " + result.ToString()); }

That's all there is to it. It's not very complicated, it's just not well known.

Download the example to experiment with it and to see additional details.