& Operator (Visual Basic)
Generates a string concatenation of two expressions.
If the data type of expression1 or expression2 is not String but widens to String, it is converted to String. If either of the data types does not widen to String, the compiler generates an error.
The & operator can be overloaded, which means that a class or structure can redefine its behavior when an operand has the type of that class or structure. If your code uses this operator on such a class or structure, be sure you understand its redefined behavior. For more information, see Operator Procedures (Visual Basic).
The ampersand (&) character can also be used to identify variables as type Long. For more information, see Type Characters (Visual Basic).