How to: Check an Exception's Inner Exception (Visual Basic)
In cases where an exception is thrown as a direct result of a previous exception, the InnerException property describes the original error. This information may allow you to handle the error more efficiently. If there is no original error, the value of InnerException will be a null reference or Nothing in Visual Basic. This property is read-only.
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To check an InnerException
Check the InnerException property of the exception to determine the cause of the original error.