title: SelectedIndexChanged() event of a dropdownlist on a checkbobx checking
body: <p>I have a checkbox to indicate that communication address is same as the permanent address. There are 4 dropdownlists - </p>
  
  <ol>
  <li>DRP_Comm_Country1</li>
  <li>DRP_Comm_State1</li>
  <li>DRP_Per_Country2</li>
  <li>DRP_Per_State2</li>
  </ol>
  
  <p>When i check the checkbox, the items of permanent address dropdownlists should be same as that of  communication address dropdownlists.How to make it possible?</p>
  
  <p>My code is</p>
  
  <pre><code>protected void CheckBox2_CheckedChanged(object sender, EventArgs e)
  {
      DRP_Per_Country2.SelectedIndex = DRP_Comm_Country1.SelectedIndex;
  }
  </code></pre>
  
  <p>But the <code>SelectedIndexChanged(</code>) Event of <code>DRP_Per_Country2</code> is not get fired.Is it a wrong method? If so ,how to work it?</p>