Get error on RadGrid filter. Sys.WebForms.PageRequestManagerServerErrorException: Expression expected

[Alessio]

Hi, i've a problem with RadGrid filter.

I add columns runtime and all works fine unless i try to filter. When do this i got the exception...Here my code:

    <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" />
    <telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" LoadingPanelID="RadAjaxLoadingPanel1">
        <telerik:RadGrid Width="100%" ID="RadGridUtenti" runat="server"  AllowFilteringByColumn="true"
            OnSelectedIndexChanged="RadGridUtenti_SelectedIndexChanging" OnNeedDataSource="RadGridUtenti_NeedDataSource">
            <MasterTableView AllowPaging="true" TableLayout="Fixed" AllowFilteringByColumn="true" DataKeyNames="IdUtente" EditMode="InPlace" />
            <ClientSettings EnableRowHoverStyle="true" />
        </telerik:RadGrid>
    </telerik:RadAjaxPanel>



 protected void RadGridUtenti_NeedDataSource(object source, GridNeedDataSourceEventArgs e)
    {
        BindUtenti();
    }


private void BindUtenti()
    {
RadGridUtenti.Columns.Clear();

        GridBoundColumn bf = new GridBoundColumn();
        //bf.DataField = "Username";
        bf.HeaderText = "Login";
        bf.ShowFilterIcon = false;
        bf.CurrentFilterFunction = GridKnownFunction.Contains;
        bf.AutoPostBackOnFilter = false;
        bf.FilterDelay = 4000;
        RadGridUtenti.Columns.Add(bf);

RadGridUtenti.DataSource = gu.GetUtenti();
}

//Where gu.GetUtenti() return a List...

Any suggestion?

[Pavlina]

Hi Alessio,

Please set the EnableLinqExpressions for the grid instance to false in order to avoid this error. Additionally, to see how to construct the filter expression for the control, please refer to the following help article:

http://www.telerik.com/help/aspnet-ajax/grdoperatewithfilterexpression.html

the last section contains additional information on how to construct the expression.

Kind regards,
Pavlina
the Telerik team

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