Specified cast is not valid #3

Question

I have this issue where I am receiving \"Specified cast is not valid\" no errors in the Error list inside Visual Studio. Could this error becoming from my Access Database?

Answer 1

Your conjecture is almost certainly correct.

A boxed value type may only be unboxed to the type it actually is. If you have a long in there, you can't unbox it to short? directly. You have to unbox it to long (or long?) first, and then convert it to short?.

This is a pretty frequently asked question. See my article on the subject for a detailed explanation.

http://ericlippert.com/2009/03/03/representation-and-identity/