In my application i have one grid with following itemtemplate column
<telerik:RadGrid ID="gvContainerDetail" runat="server" AllowPaging="True" CellSpacing="0"
GridLines="None" AutoGenerateColumns="false" OnItemCommand="gvContainerDetail_ItemCommand"
OnItemDataBound="gvContainerDetail_ItemDataBound">
<FilterMenu EnableImageSprites="False">
</FilterMenu>
<ClientSettings>
<Selecting CellSelectionMode="None" AllowRowSelect="True" />
</ClientSettings>
<MasterTableView>
<Columns>
<telerik:GridTemplateColumn HeaderText="Container Type" DataField="ContainerType"
HeaderStyle-HorizontalAlign="Center">
<ItemTemplate>
<telerik:RadComboBox ID="cbContainerType" Height="100px" Width="200px" runat="server"
ItemsPerRequest="10" ShowMoreResultsBox="true" EnableVirtualScrolling="true"
EnableAutomaticLoadOnDemand="False" AccessKey="T" MarkFirstMatch="true" EmptyMessage="Select"
HighlightTemplatedItems="true">
</telerik:RadComboBox>
<asp:Label ID="lblContainrtTypeId" runat="server" Text='<%#Eval("nContainerId") %>'></asp:Label>
<asp:RequiredFieldValidator ID="rfvcbContainerType" runat="server" ControlToValidate="cbContainerType"
ForeColor="Red" ValidationGroup="vgBooking" Display="none" EnableClientScript="true">
</asp:RequiredFieldValidator>
</ItemTemplate>
</telerik:GridTemplateColumn>
<telerik:GridTemplateColumn HeaderText="No Of Container" UniqueName="Container" DataField="ContainerNo">
<ItemTemplate>
<telerik:RadNumericTextBox ID="txtContainer" Text='<%#Eval("NoOfContainer") %>' Width="200px"
runat="server" MaxLength="10" MinValue="1" MaxValue="2147483647">
<NumberFormat GroupSeparator="" DecimalDigits="0" />
</telerik:RadNumericTextBox>
<span style="color: Red; font-weight: normal; font-size: 20px; vertical-align: middle;">
*</span>
<asp:RequiredFieldValidator ID="rfvtxtContainer" runat="server" ControlToValidate="txtContainer"
ForeColor="Red" ValidationGroup="vgBooking" Display="none" EnableClientScript="true">
</asp:RequiredFieldValidator>
</ItemTemplate>
</telerik:GridTemplateColumn>
<telerik:GridTemplateColumn UniqueName="Container" HeaderStyle-HorizontalAlign="Center">
<ItemTemplate>
<telerik:RadButton ID="btnAddContainer" Width="100px"
runat="server" Text="+" Font-Bold="True" OnClick="btnAddContainer_Click">
</telerik:RadButton>
</ItemTemplate>
</telerik:GridTemplateColumn>
</Columns>
</MasterTableView>
</telerik:RadGrid>
and one submit button
<telerik:RadButton ID="btnsubmit " Width="100px" runat="server" Text="Submit"
Font-Bold="True" OnClick="btnsubmit _Click" ValidationGroup="vgBooking">
</telerik:RadButton>
and ajax manager is
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
<AjaxSettings>
<telerik:AjaxSetting AjaxControlID="btnAddContainer">
<UpdatedControls>
<telerik:AjaxUpdatedControl ControlID="gvContainerDetail" > </telerik:AjaxUpdatedControl>
</telerik:AjaxUpdatedControl>
</UpdatedControls>
</telerik:AjaxSetting>
</AjaxSettings>
</telerik:RadAjaxManager>
after clicking on submit button first time validation works properly and if i click on '+' button in grid one row is added in grid the ajax is works correctly but problem is that if i am clicked on again submit button the client side validation in grid is not working the page is post back
