Why can't I databind with a column using aggregate

[William]

Everything works fine, but as soon as I try to use Aggregate and FooterAggregateFormatString, it comes up with a target invocation exception on my databind line.  Am I supposed to do it a different way?

My aspx file has:

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" DefaultLoadingPanelID="RadAjaxLoadingPanel1" UpdateInitiatorPanelsOnly="true">
        <AjaxSettings>
            <telerik:AjaxSetting AjaxControlID="myRadGrid">
                <UpdatedControls>
                    <telerik:AjaxUpdatedControl ControlID="myRadGrid" LoadingPanelID="RadAjaxLoadingPanel1" />
                </UpdatedControls>
            </telerik:AjaxSetting>
        </AjaxSettings>
    </telerik:RadAjaxManager>
    <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Skin="Default">
    </telerik:RadAjaxLoadingPanel>
    <telerik:RadGrid ClientSettings-Scrolling-ScrollHeight="500" ShowFooter="true" ClientSettings-Scrolling-AllowScroll="true" ClientSettings-Scrolling-UseStaticHeaders="true" RenderMode="Lightweight" OnSortCommand="SortCommand" AllowSorting="true" ID="myRadGrid" runat="server"  EnableEmbeddedSkins="False">
        <ItemStyle BackColor="#E2E4FF" Font-Size="10" />
        <AlternatingItemStyle Font-Size="10" />
        <HeaderStyle CssClass="CustomHeader" BorderStyle="Solid" BorderWidth="1" BorderColor="Black" HorizontalAlign="Center" Font-Size="12" />

        <MasterTableView AutoGenerateColumns="false" TableLayout="Fixed">
            <Columns>
                <telerik:GridTemplateColumn SortExpression="load_seconds" Aggregate="Sum" FooterAggregateFormatString="Total Seconds: {0}" HeaderButtonType="TextButton" HeaderStyle-Width="14%" HeaderText="Load Seconds">
                    <ItemTemplate>
                        <%#String.Format("{0}", Eval("load_seconds")) %>
                    </ItemTemplate>
                </telerik:GridTemplateColumn>
            </Columns>
            <EditFormSettings>
                <EditColumn CancelImageUrl="Cancel.gif" InsertImageUrl="Update.gif" UpdateImageUrl="Update.gif">
                </EditColumn>
            </EditFormSettings>
        </MasterTableView>

        <HeaderStyle CssClass="CustomHeader"></HeaderStyle>

        <FilterMenu RenderMode="Lightweight"></FilterMenu>

        <HeaderContextMenu RenderMode="Lightweight"></HeaderContextMenu>
    </telerik:RadGrid>

and my aspx.vb files has:

Protected Sub loadData()
        lbl_errormsg.Text = ""
        Dim bEffDt As Date
        Dim eEffDt As Date
        Dim begEffDt As String = ""
        Dim endEffDt As String = ""

        bEffDt = Beg_Date.SelectedDate
        eEffDt = End_Date.SelectedDate
        begEffDt = bEffDt.ToString("yyyy/MM/dd")
        endEffDt = eEffDt.ToString("yyyy/MM/dd")
        Try
            myRadGrid.DataSource = FastSQL.SelectQuery("myDB", "my select statement")

        Catch ex As Exception
            lbl_errormsg.Text = "There was an error."
        End Try
        myRadGrid.DataBind()

    End Sub

with Page_load calling loadData()

[Eyup]

Hello William,

To resolve this issue, you can switch to declarative binding or NeedDataSource binding as suggested in the following article:
https://www.telerik.com/support/kb/aspnet-ajax/grid/details/how-to-bind-radgrid-properly-on-server-side

In addition, you can also check:
https://www.telerik.com/support/kb/aspnet-ajax/ajaxmanager/details/get-more-descriptive-errors-by-disabling-ajax

I hope this will prove helpful.

Regards,
Eyup
Progress Telerik