Update Panel not Working in WEB SERVER

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C#

ASP.NET

HI,


In my web application, i have use UpdatePanel for speed up the server response.
Its works fine in my local system, and our WINSERVER2008R2.

But in client side while publish my website in WEB SERVER 2008, it remain static, doesn't shows any errors

Please help me out...


Here is my Design View...

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
   <ContentTemplate>

<asp:DropDownList ID="ddl_mode" runat="server" AutoPostBack="true" onselectedindexchanged="ddl_mode_SelectedIndexChanged">
                <asp:ListItem> By Cash</asp:ListItem>
                <asp:ListItem> By Cheque</asp:ListItem>
                <asp:ListItem> By Card</asp:ListItem>
</asp:DropDownList>

 </ContentTemplate>
    </asp:UpdatePanel>

 <asp:Panel ID="Pnl_pay_Cheque" runat="server">

         <table>
            <tr align="center">
                        <td>
                            <strong>Cheque No. :</strong></td>
                        <td>
                            <asp:TextBox ID="txt_Chequeno" runat="server"></asp:TextBox>
                        </td>
                        <td>
                            <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
                                ControlToValidate="txt_Chequeno" ErrorMessage="*Required"
                                SetFocusOnError="true"></asp:RequiredFieldValidator>
                        </td>
            </tr>
            <tr align="center">
                        <td>
                            <strong>Cheque Date :</strong></td>
                        <td>
                            <asp:TextBox ID="txt_Chequedate" runat="server"
                                onclick="showCalendarControl(this)"></asp:TextBox>
                        </td>
                        <td>
                            <asp:RequiredFieldValidator ID="RequiredFieldValidator6" runat="server"
                                ControlToValidate="txt_Chequedate" ErrorMessage="*Required"
                                SetFocusOnError="true"></asp:RequiredFieldValidator>
                        </td>
             </tr>
             <tr align="center">
                        <td>
                            <strong>Bank Name :</strong></td>
                        <td>
                            <asp:TextBox ID="txt_Chequebank" runat="server"></asp:TextBox>
                        </td>
                        <td>
                            <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
                                ControlToValidate="txt_Chequebank" ErrorMessage="*Required"
                                SetFocusOnError="true"></asp:RequiredFieldValidator>
                        </td>
             </tr>
        </table>

</asp:Panel>


<asp:Panel ID="Pnl_pay_Card" runat="server">

        <table>
            <tr align="center">
                        <td>
                            <strong>Card No. :</strong></td>
                        <td>
                            <asp:TextBox ID="txt_cardno" runat="server"></asp:TextBox>
                        </td>
                        <td>
                            <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"
                                ControlToValidate="txt_cardno" ErrorMessage="*Required" SetFocusOnError="true"></asp:RequiredFieldValidator>
                        </td>
             </tr>
             <tr align="center">
                        <td>
                            <strong>Bank Name :</strong></td>
                        <td>
                            <asp:TextBox ID="txt_cardbank" runat="server"></asp:TextBox>
                        </td>
                        <td>
                            <asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server"
                                ControlToValidate="txt_cardbank" ErrorMessage="*Required"
                                SetFocusOnError="true"></asp:RequiredFieldValidator>
                        </td>
              </tr>
         </table>

</asp:Panel>

Here is my Server Code

protected void ddl_mode_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (ddl_mode.SelectedIndex == 0)
        {
            Pnl_pay_Cheque.Visible = false;
            Pnl_pay_Card.Visible = false;
            txt_enteramt.Text = "0";

        }
        else if (ddl_mode.SelectedIndex == 1)
        {
            Pnl_pay_Cheque.Visible = true;
            Pnl_pay_Card.Visible = false;
            txt_enteramt.Text = "0";

        }
        else if (ddl_mode.SelectedIndex == 2)
        {
            Pnl_pay_Card.Visible = true;
            Pnl_pay_Cheque.Visible = false;
            txt_enteramt.Text = "0";
        }
        txt_enteramt.Text = "";
    }

Actually while user Changing the DropDownlist items, i need to hide/Show the respective Panels.