ASP.NET fails to detect Internet Explorer 11

Hi,

We were facing this error "_doPostBack is undefined JavaScript" for IE 11 , to fixed this we installed the Update for the Microsoft .NET Framework 4.0(OCT 2013)on to our VM's & this issues is resolved, but when we install the same Microsoft updates on our web server, this issues is not resolved. so now we are in a confused state.

Our web server details are : Microsoft windows server 2003 R2 service pack 2 

Problem faced in a dropdown (asp:DropDownList) & Link button(asp:LinkButton).

For more details, am posting the sample code.so this will be more clear.

 <td align="right" nowrap="nowrap" style="width:50%;"><asp:LinkButton ID="PreviousLinkButton" runat="server" CssClass="paginationText" OnClick="PreviousLinkButton_Click" OnClientClick="CloseDiv();javascript:LoadingScreen.show();" Text="< Prev" meta:resourcekey="PreviousLinkButtonResource"></asp:LinkButton> <span ID="spnDivider" runat="server" style="text-align:center;color:black">|</span> </td>

Please let us know if you need any more details. Any help is much a appreciated. 

Thanks,

Punith