*= Operator (Visual Basic)


Updated: July 20, 2015

For the latest documentation on Visual Studio 2017, see Visual Studio 2017 Documentation.

Multiplies the value of a variable or property by the value of an expression and assigns the result to the variable or property.

variableorproperty *= expression  

Required. Any numeric variable or property.

Required. Any numeric expression.

The element on the left side of the *= operator can be a simple scalar variable, a property, or an element of an array. The variable or property cannot be ReadOnly.

The *= operator first multiplies the value of the expression (on the right-hand side of the operator) by the value of the variable or property (on the left-hand side of the operator). The operator then assigns the result of that operation to the variable or property.

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. Overloading the * operator affects the behavior of the *= operator. If your code uses *= on a class or structure that overloads *, be sure you understand its redefined behavior. For more information, see Operator Procedures.

The following example uses the *= operator to multiply one Integer variable by a second and assign the result to the first variable.

        Dim var1 As Integer = 10
        Dim var2 As Integer = 3
        var1 *= var2
        ' The value of var1 is now 30.

* Operator
Assignment Operators
Arithmetic Operators
Operator Precedence in Visual Basic
Operators Listed by Functionality