i using update panel local its not working properly

Question

i using update panel local its working fine but in server not working properly.

 

this is my code:

 

<asp:UpdatePanel ID="updtaepanel1" runat="server" UpdateMode="Conditional">

<ContentTemplate>

<div style="text-align: center">

<asp:Label ID="lblSmlHdg" runat="server" Text="XBRL" CssClass="mediumred"></asp:Label>

<asp:Label ID="lblSubHdg" CssClass="mediumnavy" runat="server" Text=">Element Mapping To GL" />

<br />

<asp:Label ID="lblHdg" runat="server" CssClass="hdg2" Text="ELEMENT MAPPING TO GL" />

<br />

<asp:Button runat="server" ID="btnBack" CssClass="button" Text="Back" OnClick="btnBack_Click"/>

<asp:GridView ID="XbrlGLGrid" runat="server" Width="50%" AutoGenerateColumns="False" onrowdatabound="XbrlGLGrid_RowDataBound" >

<HeaderStyle CssClass="header" Height="15px" Width="100px" />

<FooterStyle CssClass="smallheader" />

<RowStyle CssClass="smallnavy" />

<Columns>

<asp:BoundField HeaderText="Col.No." DataField="ColNo" ItemStyle-Width="10px" HeaderStyle-Width="10px"/>

<asp:BoundField DataField="ElementName" HeaderText="RBI GL Name" ItemStyle-Horizontal ItemStyle-Width="20px" HeaderStyle-Width="20px" ItemStyle-Wrap="true">

<ItemStyle Width="150%" Horizontal />

</asp:BoundField>

<asp:TemplateField HeaderText="GL Code" ControlStyle-BorderWidth="1px" ItemStyle-Horizontal ItemStyle-Width="100px" HeaderStyle-Width="90px">

<ItemTemplate>

<asp:TextBox ID="txtGLCode" runat="server" CausesValidation="false" CssClass="tooltip" Width="100px" EnableViewState="true"

ToolTip="For Help, Double Click or Press F2" AutoCompleteType="Disabled" AutoPostBack="True"

OnTextChanged="txtGLCode_TextChanged"></asp:TextBox>

</ItemTemplate>

<ControlStyle BorderWidth="1px" BorderColor="Silver" />

</asp:TemplateField>

<asp:BoundField DataField="GlCode" HeaderText="Mapped GL Codes" ItemStyle-Horizontal ItemStyle-Width="200px" HeaderStyle-Width="100px"/>

<asp:BoundField DataField="Amount" HeaderText="Value" ItemStyle-HorizontalAlign="Right" ItemStyle-Width="100px" HeaderStyle-Width="110px" />

<asp:BoundField HeaderText="Enable" DataField="Enable" ItemStyle-CssClass="hiddencol" HeaderStyle-CssClass="hiddencol"/>

</Columns>

</asp:GridView>

</div>

<asp:Button ID="btnHidden" runat="server" style = "display:none" CssClass="button" />

<%-- <asp:ScriptManager ID="ScriptManager1" runat="server">

</asp:ScriptManager> --%>

<Ajax:ModalPopupExtender ID="mp1" runat="server" PopupControlID="Panel1" TargetControlID="btnHidden"

CancelControlID="btnNo" BackgroundCssClass="Background">

</Ajax:ModalPopupExtender>

<asp:Panel ID="Panel1" runat="server" CssClass="Popup" align="center" style = "display:none">

<br />

<asp:Label ID="lblAlert" runat="server"></asp:Label>

<asp:Label ID="lblGlCode_hidden" runat="server" Visible="false"></asp:Label>

<br /><br />

<asp:Button ID="btnYes" runat="server" Text="Yes" OnClick="btnYes_Click" CssClass="button" />

<asp:Button ID="btnNo" runat="server" Text="No" CssClass="button" />

</asp:Panel>

</ContentTemplate>

<Triggers>

<asp:AsyncPostBackTrigger ControlID="XbrlGLGrid" EventName="RowCommand" />

<asp:AsyncPostBackTrigger ControlID="btnYes" EventName="click" />

<asp:AsyncPostBackTrigger ControlID="btnNo" EventName="click" />

<%-- <asp:AsyncPostBackTrigger ControlID="txtGLCode" EventName="TextChanged" />--%>

</Triggers>

</asp:UpdatePanel>