System.Data.SqlClient.SqlException: A severe error occurred on the current command. The results, if any, should be discarded.
That’s not a very helpful error message!
Googling doesn’t throw up much except for KB article 961283. However after installing Cumulative Update 3 the problem remained, so that wasn’t it.
Narrowing down the problem highlighted a stored procedure using a CURSOR while talking to a linked server.
Re-writing the stored procedure without a cursor gave back a more descriptive error (trying to set a non-nullable column to null!). Now it was easy to fix.
Thanks to Timothy, SQL guru :-) I’ll let him describe how he writes T-SQL that avoids cursors.