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*= Operator (C# Reference)

The binary multiplication assignment operator.

An expression using the *= assignment operator, such as

x *= y

is equivalent to

x = x * y

except that x is only evaluated once. The * operator is predefined for numeric types to perform multiplication.

The *= operator cannot be overloaded directly, but user-defined types can overload the * operator (see operator).

// cs_operator_multiplication_assignment.cs
using System;
class MainClass
    static void Main() 
        int a = 5;
        a *= 6;