title: DropDownList Client-side onchange stops Server-side SelectedIndexChanged event
body: <p>How to call the clientside script and server-side script at same time.
  I cannot able to use both at same time.</p>
  
  <pre><code>&lt;asp:DropDownList ID="ddlModule" runat="server" Width="200px" AutoPostBack="True"
                              OnSelectedIndexChanged="ddlModule_SelectedIndexChanged" /&gt;
  </code></pre>
  
  <p>In Page_Load</p>
  
  <pre><code>ddlModule.Attributes.Add("onchange", "javascript:return validateDropDown('" + ddlModule.ClientID + "');");
  </code></pre>
  
  <p>if client script execute then server side not working.</p>
  
  <p>Please Help..</p>
  
  <p>Thanks,</p>