error on init sortExpression in code behind

[Murray]

I tried the following in my Page_Load event based on search in forum:
protected void Page_Load(object sender, EventArgs e)
{
    ...
    // make call to get data
    List<QMarkRow> qmarkRows = qmd.getData(
        sessFilter,
        sessSort,
        pageSize);

    // set datasource
    grdList.DataSource = qmarkRows;
    grdList.VirtualItemCount = qmd.Count;
    grdList.PageSize = pageSize;
    grdList.CurrentPageIndex = qmd.PageIndex;
    grdList.DataBind();
    // tried below in GrdList_PreRender event still error
    if (sessSort != null && sessSort.Length > 0)
    {
        // create GridSortExpression and add to grid
        // format of sessSort: Sort<Coln> <ASC|DESC>
        GridSortExpression gse = new GridSortExpression();
        int index = sessSort.IndexOf(" ");
        gse.FieldName = sessSort.Substring(4, index - 4);
        gse.SortOrder = sessSort.Substring(index + 1).Equals("ASC") ? GridSortOrder.Ascending : GridSortOrder.Descending;
        grdList.MasterTableView.SortExpressions.Add(gse);
        grdList.MasterTableView.Rebind();
    }
...
}
I get error on Rebind() call:
IndexOutOfRangeException was unhandled by user code
cannot find column Col1

Col1 is defined in grid:
<telerik:RadGrid
        ID="grdList" runat="server"
        EnableViewState="false"
        Height="328px"
        AllowPaging="true"
        AllowCustomPaging="true"
        AllowSorting="true"
        AllowFilteringByColumn="true"
        AutoGenerateColumns="False"
        PageSize="12"
        Skin="WebBlue" OnPreRender="GrdList_PreRender">
    <MasterTableView
            ClientDataKeyNames="Col1,Col2,Col3,Col4,Col5,Col6,Col7,Col8,Col9,Col10"
            EnableViewState="False">
        <Columns>
            <telerik:GridBoundColumn DataField="Col1" UniqueName="Col1"
                DataType="System.String"
                HeaderText="COL1" Visible="false" DataFormatString="<nobr>{0}</nobr>" >
                <HeaderStyle Width="80px" HorizontalAlign="left"  />
                <ItemStyle Width="80px" HorizontalAlign="left" />
            </telerik:GridBoundColumn>                        
...

This grid is defined in user control and everything else works except setting sortExpression.

[Pavlina]

Hi Murray,

I went through your code and noticed that you use simple binding with DataBind() calls. In order to avoid this problem, please consider switching to advanced binding with NeedDataSource even handling or assign a data source control for the grid and let me know whether this addresses the issue.

Regards,
Pavlina
the Telerik team

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