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Trying to use filtering with a WebDataGrid bound to a DataTable

Sort works fine.  The initial use of the filter works fine.  If I try to do just about anything after setting a filter (clear the filter, filter another column, sort filtered data) I get a Client side error of [NullReferenceException at Infragistis.Web.UI.GridControls.Filtering.SaveClientObjects(ArrayListpropertyObjectList) ...

Anybody else with better luck doing so?

I have attached the HTML and C# code.