ExportOnlyData="true" causes null reference exception

[Brent]

I am encountering a null reference exception when I set ExportOnlyData="true" and try to export to any format.  If I set ExportOnlyData="false", everything works fine.

Here are the exception details:

[NullReferenceException: Object reference not set to an instance of an object.]
   Telerik.Web.UI.RadAjaxControl.OnPagePreRenderComplete(Object sender, EventArgs e) +116
   System.EventHandler.Invoke(Object sender, EventArgs e) +0
   System.Web.UI.Page.OnPreRenderComplete(EventArgs e) [phone]
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3671

Here is my markup:

<telerik:RadGrid ID="grdResults" Visible="true" runat="server" Skin="WebBlue" AutoGenerateColumns="false"
    PageSize="20" AllowPaging="true" AllowSorting="true" OnItemCommand="grdResults_ItemCommand"
    OnNeedDataSource="grdResults_NeedDataSource">
    <ExportSettings FileName="EmployeeSearchResults" ExportOnlyData="true">
    </ExportSettings>
    <PagerStyle Mode="NumericPages" HorizontalAlign="Center" VerticalAlign="Top" AlwaysVisible="true"
        Position="Bottom"></PagerStyle>
    <MasterTableView DataKeyNames="UserId" CommandItemDisplay="Top">
    <CommandItemSettings ShowAddNewRecordButton="false" ShowRefreshButton="false"  ShowExportToCsvButton="true" ShowExportToExcelButton="true" ShowExportToPdfButton="true" ShowExportToWordButton="true" />
        <Columns>
            <telerik:GridTemplateColumn>
                <ItemTemplate>
                    <telerik:RadAjaxPanel runat="server">
                        <asp:CheckBox ID="chk" runat="server" Checked='<%# Eval("Selected") %>' AutoPostBack="true" OnCheckedChanged="chk_CheckedChanged" />
                        <asp:HiddenField ID="hdn" runat="server" Value=<%# Eval("UserId") %> />
                    </telerik:RadAjaxPanel>
                </ItemTemplate>
            </telerik:GridTemplateColumn>
            <telerik:GridBoundColumn SortExpression="EmployeeId" DataField="EmployeeId" HeaderText="Employee ID">
            </telerik:GridBoundColumn>
            <telerik:GridButtonColumn ButtonType="LinkButton" DataTextField="UserName" HeaderText="Name"
                SortExpression="UserName" CommandName="UserProfile">
            </telerik:GridButtonColumn>
            <telerik:GridBoundColumn SortExpression="Title" DataField="Title" HeaderText="Title">
            </telerik:GridBoundColumn>
            <telerik:GridBoundColumn SortExpression="CompanyName" DataField="CompanyName" HeaderText="Org / Org Unit">
            </telerik:GridBoundColumn>
            <telerik:GridBoundColumn SortExpression="ManagerName" DataField="ManagerName" HeaderText="Manager">
            </telerik:GridBoundColumn>
            <telerik:GridBoundColumn SortExpression="EmailAddress" DataField="EmailAddress" HeaderText="Email Address">
            </telerik:GridBoundColumn>
        </Columns>
    </MasterTableView>
</telerik:RadGrid>

I am using advanced databinding for my datasource, but I have noticed that the NeedsDataSource event never fires when I try to export only data:

        protected void grdResults_NeedDataSource(object sender, Telerik.Web.UI.GridNeedDataSourceEventArgs e)
        {
            EmployeeSearchCriteriaDTO criteria = SessionManager.SM.EmployeeSearchCriteria;

            if (criteria != null)
            {
                IList<EmployeeSearchResultDTO> temp = EmployeeSearchManager.Query2(criteria);

                if (SessionManager.SM.ComparisonUserIDs != null)
                {
                    foreach (int id in SessionManager.SM.ComparisonUserIDs)
                    {
                        EmployeeSearchResultDTO user = temp.FirstOrDefault(r => r.UserId == id);
                        if (user != null)
                            user.Selected = true;
                    }
                }
                grdResults.DataSource = temp;
            }
        }

Any ideas?

[Daniel]

Hello Brent,

Please try to set RestoreOriginalRenderDelegate to false.

<telerik:RadAjaxPanel ID="RadAjaxPanel1" RestoreOriginalRenderDelegate="false" runat="server">
    <asp:CheckBox ID="chk" runat="server" Checked='<%# Eval("Selected") %>' AutoPostBack="true" />
    <asp:HiddenField ID="hdn" runat="server" Value='<%# Eval("UserId") %>' />
</telerik:RadAjaxPanel>

Regards,
Daniel
the Telerik team

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[Brent]

That was it!  Thanks so much!