Here is the stack trace
System.NullReferenceException: Object reference not set to an instance of an object.
at Telerik.WinControls.UI.Export.CSV.CellElement.EscapeQuotesInValue()
at Telerik.WinControls.UI.Export.CSV.CellElement.RenderChildElements(StringBuilder sb)
at Telerik.WinControls.UI.Export.CSV.ElementBase.Render(StringBuilder sb)
at Telerik.WinControls.UI.Export.CSV.RowElement.RenderChildElements(StringBuilder sb)
at Telerik.WinControls.UI.Export.CSV.ElementBase.Render(StringBuilder sb)
at Telerik.WinControls.UI.Export.ExportToCSV.FileWriteElement(FileStream fileStream, ElementBase csvElement, Int32 cutLastSymbols)
at Telerik.WinControls.UI.Export.ExportToCSV.AddCSVRow(GridViewRowInfo gridRowInfo, FileStream fileStream, TableElement csvTableElement)
at Telerik.WinControls.UI.Export.ExportToCSV.RunExport(String fileName)
Thanks
Deepak