ExportOnlyData="true" causes null reference exception

3 posts, 0 answers
  1. Brent
    Brent avatar
    14 posts
    Member since:
    Apr 2008

    Posted 20 May 2010 Link to this post

    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) +11039453
       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" 
        <ExportSettings FileName="EmployeeSearchResults" ExportOnlyData="true"
        <PagerStyle Mode="NumericPages" HorizontalAlign="Center" VerticalAlign="Top" AlwaysVisible="true" 
        <MasterTableView DataKeyNames="UserId" CommandItemDisplay="Top"
        <CommandItemSettings ShowAddNewRecordButton="false" ShowRefreshButton="false"  ShowExportToCsvButton="true" ShowExportToExcelButton="true" ShowExportToPdfButton="true" ShowExportToWordButton="true" /> 
                        <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:GridBoundColumn SortExpression="EmployeeId" DataField="EmployeeId" HeaderText="Employee ID"
                <telerik:GridButtonColumn ButtonType="LinkButton" DataTextField="UserName" HeaderText="Name" 
                    SortExpression="UserName" CommandName="UserProfile"
                <telerik:GridBoundColumn SortExpression="Title" DataField="Title" HeaderText="Title"
                <telerik:GridBoundColumn SortExpression="CompanyName" DataField="CompanyName" HeaderText="Org / Org Unit"
                <telerik:GridBoundColumn SortExpression="ManagerName" DataField="ManagerName" HeaderText="Manager"
                <telerik:GridBoundColumn SortExpression="EmailAddress" DataField="EmailAddress" HeaderText="Email Address"

    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?

  2. Daniel
    Daniel avatar
    4933 posts

    Posted 26 May 2010 Link to this post

    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") %>' />

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  4. Brent
    Brent avatar
    14 posts
    Member since:
    Apr 2008

    Posted 26 May 2010 Link to this post

    That was it!  Thanks so much!
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