message
The error message that explains the reason for the exception.
inner
The exception that is the cause of the current exception.
An exception that is thrown as a direct result of a previous exception should include a reference to the previous exception in the System.Exception.InnerException property. The InnerException property returns the same value that is passed into the constructor. If the InnerException property does not supply the inner exception value to the constructor, it will be set to a null reference (Nothing in VB).