Check out example codes for "winforms messagebox with button". It will help you in understanding the concepts better.
Code Example 1
string message = "Do you want to close this window?";
string title = "Close Window";
MessageBoxButtons buttons = MessageBoxButtons.YesNo;
DialogResult result = MessageBox.Show(message, title, buttons);
if (result == DialogResult.Yes) {
this.Close();
} else {
// Do something
}
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