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Message: [QUOTE="jmcilhinney, post: 170087, member: 641"] Did you look at the stack trace for the exception? That will tell you exactly which method the exception is being thrown in and that will tell you which value cannot be null. You should also look at the type of the exception. I'm guessing that it's an ArgumentNullException, which means that Nothing is being passed an argument to a method that is not allowed to be Nothing. Once you know which method and which parameter, then you can trace the source of the null value. [/QUOTE]