&= Operator
Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here. ArchiveDisclaimer

&= Operator (Visual Basic)

Concatenates a String expression to a String variable or property and assigns the result to the variable or property.

variableorproperty &= expression


Required. Any String variable or property.


Required. Any String 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 (Visual Basic). The &= operator assigns the value on its right to the variable or property on its left.


The & Operator (Visual Basic) 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 concatenate two String variables and assign the result to the first variable.

Dim var1 As String = "Hello " 
Dim var2 As String = "World!"
var1 &= var2
' The value of var1 is now "Hello World!".
© 2016 Microsoft