title: how to know Changes has done in my form before update
body: <p>After retriving the data from database, When I click the Update button there will raise a messagebox  as "Changes has done.Do u like to proceed" with Yes/No buttons. But i want to raise the message box when I made any changes only. If i didn't make any changes it should not raise.. Please help me how to know the changes in my textboxes and comboxes.
  My code for raising is</p>
  
  <pre><code>DialogResult result = MessageBox.Show("Chanes has done, Do you wish to save changes.?", "Message",MessageBoxButtons.YesNo, MessageBoxIcon.Question);
  if (result == DialogResult.Yes)
  {
  // HERE MY UPDATE CODE.
  }
  </code></pre>