Validation inside gridview which is inside update panel

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ASP.NET

Gridview

validation

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Hi Folks,

I have a Gridview which i placed inside an update panel.
And i have a column with text box inside Gridview, Which should allow only numeric values. Without update panel validation working fine.After adding update panel validation msg shows and goes off..
Note that Once i come out of the text box in Gridview i am triggering a textbox changed event.


Thanks in Advance
Coder

What I have tried:

<asp:ScriptManager ID="sm1" runat="server"></asp:ScriptManager>
    <asp:UpdatePanel ID="Up1" runat="server" 
    UpdateMode="Conditional" ChildrenAsTriggers="true">
    <ContentTemplate>
                        <asp:GridView ID="gvLabTATList" runat="server" AutoGenerateColumns="False" DataKeyNames="serviceid"
                            CssClass="grid-view" OnRowDataBound="gvLabTATList_RowDataBound" orderColor="#222222"
                            BorderStyle="Solid" BorderWidth="1px" ShowFooter="true">
                            <Columns>
                                <asp:TemplateField HeaderText="S No">
                                    <ItemTemplate>
                                        <%# Container.DataItemIndex + 1 %>
                                        <asp:HiddenField ID="hdnServiceID" runat="server" Value='<%# Eval("serviceid") %>' />
                                        <asp:HiddenField ID="hdnID" runat="server" Value='<%# Eval("TATId") %>' />
                                        <asp:HiddenField ID="hdnIsChanged" runat="server" Value='0' />
                                    </ItemTemplate>
                                </asp:TemplateField>
                                <asp:TemplateField HeaderText="Service" ItemStyle-Width="250">
                                    <ItemTemplate>
                                        <asp:Label ID="txtServiceName" runat="server" CausesValidation="True" Text='<%# Eval("servicename") %>'></asp:Label>
                                    </ItemTemplate>
                                    <ItemStyle Width="250px"></ItemStyle>
                                </asp:TemplateField>
                                <asp:TemplateField HeaderText="NTDay" ItemStyle-Width="50">
                                    <ItemTemplate>
                                        <asp:TextBox ID="txtNTDay" runat="server" Text='<%# Eval("NTDay") %>' AutoPostBack="true"   ontextchanged="txt_TextChanged" 
                                            Style="width: 50px;"></asp:TextBox>
                                    </ItemTemplate>
                                    <ItemStyle Width="50px"></ItemStyle>
                                </asp:TemplateField>