Invalid cast exception means that an item you are trying to cast (and we can't see it) from one type to another is not convertible between the two types.
Don't post stupid little screen grabs: post the relevant code fragment into your question. That way we get to see the line causing the problem (indicate which it is, and add the actual error message) and some of the context of that line - in this case hopefully the type of the various objects involved, which is prewtty fundamental to solving your problem.
The more you help us, the more we can help you.
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