Empty cell

Hi, I have a DataTable with three columns: BranchID (Int32), CategoryID (Int32) and PartID (string). I bound this datatable to a GridDataBoundGrid and then I create the grid bound columns - using table''s columns. The problem that I have is when I validate the data: if I''ve entered the CategoryID column, but for whatever reason I want to go back in the Branch column to make some changes, leaving CategoryID blank, I do get a long error message saying that I did not entered and Int32 (all I want, is to leave the CategoryID cell without putting anything in there).

What are you doing to validate the data? There does not appear to be a problem leaving the CategoryID column blank in this sample. WindowsApplication11_3039.zip