Thank you for your reply. I've since figured out what the problem could be: RadGrid doesn't handle all SQL Server data types correctly when it's set to auto-generate columns. The error appears when:
- There's a NUMERIC field or DATETIME field returned by my Stored Procedure.
- I specify every column for each RadGrid, with one exception: If the column is a DATETIME value, I have to convert to it to a VARCHAR value before returning it or this error appears regardless, e.g:
convert(varchar(10), DateStamp, 111)
So, to solve the problem I now specify each column for each Rad Grid and convert all my DATETIME values to VARCHAR. This isn't really ideal, I was hoping that the RadGrid would be able to auto-generate columns regardless of data type. I don't know if this is a known issue or bug, or if there's some sort of workaround. Got any ideas?