Operator '<operatorname>' is not defined for types '<typename1>' and '<typename2>'
Operator '<operatorname>' is not defined for types '<typename1>' and '<typename2>'. Use 'Is' operator to compare two reference types.
An attempt was made to use an operator in a way that is inappropriate for the specified types. This error can be caused by using the "=" operator instead of using the Is operator to compare two objects.
Error ID: BC31080
To correct this error
Use Is operator to compare two reference types.
Use the Not operator in conjunction with the Is operator to denote inequality. For example:
If Not A Is B Then