11.5.3 Is Expressions
An Is expression is used to do a reference equality comparison. Each expression must be classified as a value and the type of each expression must be a reference type. The result is classified as a value and is typed as Boolean. The expression evaluates to True if both values refer to the same instance or False otherwise.
IsExpression ::= Expression Is Expression
11.4.1 Literal Expressions | 11.4.2 Parenthesized Expressions | 11.4.3 Instance Expressions | 11.5.1 GetType Expressions | 4.8 Variables | 11.5.2 TypeOf...Is Expressions | 11. Expressions | Is Operator (Visual Basic Language Reference) | Expressions (Visual Basic Language Concepts)