>Hi Bonnie,
> I would say that all the columns are causing the problem. When I step through, the ReadOnly attribute is false on all columns of the DataTable (except for the Primary Key) until I hit the following code:
>
>// Fill the specified table in the DataSet
>adapter.Fill(ds, tableName);
>
>After this line runs, all the columns in the DataTable switch to ReadOnly = true (for the offending stored procedure that is)
>
>
>Don

Have you tried to not use Dynamic SQL in this SP? Someone mentioned today that dynamic SQL may cause this problem and I think it's very likely to be the cause.

(BTW, funny - I used 'cause' twice in the same sentence - once as a verb and once as a noun)