use of YesNoCancel in messagebox.show() method in C#.net 2005 winform application

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
e.Cancel = false;
DialogResult result = MessageBox.Show("Do you want to save any changes before closing this window? \n\n Click on 'Yes' to save; or \n Click on 'No' to close without saving; or \n Click on 'Cancel' to do nothing.", "Closing Window", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question, MessageBoxDefaultButton.Button3);

if (result == DialogResult.Yes)
{
MessageBox.Show("you clicked on YES, c u!");
}
else if (result == DialogResult.No)
{
MessageBox.Show("you clicked on NO, c u!");
}
else
{
e.Cancel = true;
}
}