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.",
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.