Page Getting Refreshed Despite Using Update Panel

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C#3.5

Hello,


I am using update panel but still my page is getting refreshed on selected index changed

<asp:UpdatePanel ID="Updrop" runat="server" UpdateMode="Conditional">
       <ContentTemplate>
           <td><asp:DropDownList ID="ddlEmployeeName" runat="server"  AutoPostBack="true" Width="150px"
               onselectedindexchanged="ddlEmployeeName_SelectedIndexChanged" Height="16px" ></asp:DropDownList>
           </td>
           </ContentTemplate>
   </asp:UpdatePanel>

Regards
Madhu