title: ComboBox SelectedIndexChanged event: how to get the previously selected index?
body: <p>I have a user control which has a ComboBox and a SelectedIndexChanged event handler.  In the event handler, I need to be able to tell what was the previously selected index... can anyone point me in the right direction?</p>
  
  <pre><code>private void cboTargetMode_SelectedIndexChanged(object sender, EventArgs e)
  {
      // need to get the previously selected index and do some handling here...
      // ... some handler code here ...
  
  
      switch (cboTargetMode.SelectedIndex)
      {
          case 1:  // ..... some code here...
              break;
          case 2:  // ..... some code here...
              break;
          case 3:  // ..... some code here...
              break;
          default: // ..... some code here...
              break;
      }
  }
  </code></pre>