title: ComboBox validation
body: <p>I am doing a project in c# and need to validate two <code>ComboBoxes</code>. If the two <code>ComboBoxes</code> show the same value, an error message should appear saying that you cannot select the same value. </p>
  
  <pre><code>private void btnBook_Click(object sender, EventArgs e)
  {
      if (cmbDeaprture == cmbDestination);
          MessageBox.Show("Cannot have the same Destination as Departure");
  }
  </code></pre>
  
  <p>That's my code, but does not seem to work. Any help? Im new to c# so still learning.</p>