Frequently, when you change and save a table adapter in the dataset designer, the debugger lists hundreds of errors.
When you look at the errors, it is clear that the syntax analyzer has not caught up with the new file, and is reporting errors where there are none. You can wait about 15 minutes (yeah, as if!) for the syntax analyzer to catch up with itself, or you have to force a rebuild.
This is NOT a PC performance issue - it is the awful syntax analyzer!
Please speed it up, so we don't have to divert and do a rebuild...