Question

If userA deleted OrderA while userB is modifying OrderA, then userB saves OrderA then there is no order in the database to be updated. My problem is there is no error! The SqlDataAdapter.Update succeeds and returns a “1” indicating a record was modified when this is not true. Does anybody know how this is supposed to work, thanks.

Answer 1

You need to use, at the very least, optimistic locking. See here:

Optimistic Locking

Basically, this says that you check the values of all fields during the update. So you say, for example assuming when you first read record 1, bar was equal to 0:

UPDATE FOO SET BAR=1 WHERE ID=1 AND BAR=0

The idea is, if the record changes, the update will fail. This will solve your problem.