A column named 'CAT' already belongs to this DataTable

[qxuRad]

Hi,
      I am using ASP.NET AJAX RadGrid 2008.2.826.20. 
    
     I dynmaically create the Grid and GroupByExpressions, and it works fine.

     But as long as I set the aggregate of the GroupByExpression SelectField,  like (grpSelFld.Aggregate = GridAggregateFunction.Count),  Or  set the group sub totoal,  then I got an error below. 
      
      Please help to resolve this issue.  Thanks!
     
         A column named 'CAT' already belongs to this DataTable

    Stack Trace:

[DuplicateNameException: A column named 'CAT' already belongs to this DataTable.] System.Data.DataColumnCollection.RegisterColumnName(String name, DataColumn column, DataTable table) +2020769 System.Data.DataColumnCollection.BaseAdd(DataColumn column) +79 System.Data.DataColumnCollection.AddAt(Int32 index, DataColumn column) +74 System.Data.DataColumnCollection.Add(String columnName, Type type) +48 Telerik.Web.UI.GridDataSetHelper.CreateGroupByTable(DataTable SourceTable, GridTableView view) +304 Telerik.Web.UI.GridEnumerableFromDataView.PerformTransformation() +3605 Telerik.Web.UI.GridEnumerableFromDataView.TransformEnumerable() +18 Telerik.Web.UI.GridTableView.GetEnumerator(Boolean useDataSource, GridEnumerableBase resolvedDataSource, ArrayList dataKeysArray) +105 Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource) +181 Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource) +539 System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data) +59 System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) +111 System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +29 System.Web.UI.WebControls.DataBoundControl.PerformSelect() +149 Telerik.Web.UI.GridTableView.PerformSelect() +4 System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +70 Telerik.Web.UI.GridTableView.DataBind() +304 Telerik.Web.UI.RadGrid.DataBind() +77 Telerik.Web.UI.RadGrid.AutoDataBind(GridRebindReason rebindReason) +2323 Telerik.Web.UI.RadGrid.OnLoad(EventArgs e) +120 System.Web.UI.Control.LoadRecursive() +47 System.Web.UI.Control.LoadRecursive() +131 System.Web.UI.Control.LoadRecursive() +131 System.Web.UI.Control.LoadRecursive() +131 System.Web.UI.Control.LoadRecursive() +131 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1436

[Yavor]

Hello qxuRad,

This looks like a databinding issue.
However, in order to further investigate the case, please open a formal support ticket, and send us the problematic code, for additional debugging.

Regards,
Yavor
the Telerik team

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