"ChildObject(0).sFullName"  or "ChildObject.(0).sFullName" 

GetType(String)

This work perfectly fine and we are able to see the data as required.
But the issue is that when we are  trying to filter on this column its not responding at all and seems like its not able to find the column itself.Hence the grid is still intact with same number of rows.
We have also set the EnableLinqExpressions = false, hence filtering operation is more close to SQL version.
I also tried setting the FilterExpression manually before the NeedDataSource Event and check that expression is still there.But still same result.
Please let me know if you have ideas.
Thanks for  your help in advance

Regards,
Aayam Singh

The following UserControl, OpportunityList.ascx, using the Ajaxed RadGrid refreshes the whole page the first time in when you click the Next button in the paging navigation bar.  Subsequently, it works properly refereshing only the control itself.  Is there a fix for this?

[By the way we bind the data to the radGrid in the UserControl's Page_PreRender event, otherwise we get the error 
Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.   If there is a better way to work around this error, please let us know.]

_______________________________________________________________________________________
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="OpportunityList.ascx.cs" Inherits="Deloitte.Ca.OnePortal.UserControls.OpportunityList, Deloitte.Ca.OnePortal.UserControls, Version=1.0.0.0, Culture=neutral, PublicKeyToken=97bcd997dcc9fbb7" %>
<%@ Register Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" Namespace="System.Web.UI.WebControls" TagPrefix="asp" %>
<%@ Register Assembly="Telerik.Web.UI, Version=2010.1.415.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<asp:Label ID="lblError" runat="server"></asp:Label>
<telerik:RadAjaxManager ID="radAjaxManager" runat="server">
  <AjaxSettings>
    <telerik:AjaxSetting AjaxControlID="rgdOpportunityList">
      <UpdatedControls>
        <telerik:AjaxUpdatedControl ControlID="rgdOpportunityList" LoadingPanelID="radAjaxLoadingPanel" />
      </UpdatedControls>
    </telerik:AjaxSetting>
  </AjaxSettings>
</telerik:RadAjaxManager>
<telerik:RadAjaxLoadingPanel ID="radAjaxLoadingPanel" runat="server" Skin="Default">
</telerik:RadAjaxLoadingPanel>

<telerik:RadGrid ID="rgdOpportunityList" runat="server" Width="100%"
AllowFilteringByColumn="True" AllowPaging="True" AllowSorting="True" PageSize="3"
GridLines="None" Skin="Windows7">
  <MasterTableView OverrideDataSourceControlSorting="true">
    <RowIndicatorColumn>
      <HeaderStyle Width="20px"></HeaderStyle>
    </RowIndicatorColumn>
    <ExpandCollapseColumn>
      <HeaderStyle Width="20px"></HeaderStyle>
    </ExpandCollapseColumn>
  </MasterTableView>
</telerik:RadGrid>

radC:RadComboBox runat="server" ID="RadComboBox1" AllowCustomText="True" HighlightTemplatedItems="True"

Skin="WebBlue" SkinsPath="~/RadControls/ComboBox/Skins" UseEmbeddedScripts="False"

OnClientDropDownOpening="OnClientDropDownOpening" OnClientDropDownClosing="OnClientDropDownClosing"

OnClientSelectedIndexChanging="onSelectedIndexChanging" OnClientBlur="OnClientBlur"

DropDownWidth="140px" Height="110px" Width="120px">

<ItemTemplate>

<asp:CheckBox runat="server" ID="chk" onclick="checkboxClick();" Text='<%# DataBinder.Eval(Container, "Text") %>' />

</ItemTemplate>

<Items>

<radC:RadComboBoxItem Text="All" Value="0" ID="chbSelectAll" onclick="javascript:SelectAll();" runat="server" />

<radC:RadComboBoxItem Text="Unassigned" Value="1" runat="server" />

<radC:RadComboBoxItem Text="Assigned" Value="2" runat="server" />

<radC:RadComboBoxItem Text="Reassigned" Value="4" runat="server" />

<radC:RadComboBoxItem Text="Posted" Value="5" runat="server" />

</Items>

</radC:RadComboBox>

Moderators/Admin please help.