I wanan update the content of a table in my program, before saving of course I have to check if any other is using the table, so i tried to use the example from MSDN about IsExclusive..

my program:
1: set exclusive off
2: open in 0 exclusive
3: if IsExclusive() then
4: **do the updates here**
5: else
6: **prompt error message**
7: endif

To test the program, I open the database exclusively in another program, and then run the above code. A "access denied" message pops up at line 2.

So what should I do, if I wanna ensure there's no one using the table, and then update it?

Thanks for any help in advance!

error(503): file structure failure, signature file corrupted.