&= Operator (C# Reference)

The AND assignment operator.

Remarks

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 performs a bitwise logical AND operation on integral operands and logical AND on bool operands.

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

Example

class AndAssignment
{
    static void Main()
    {
        int a = 0x0c;
        a &= 0x06;
        Console.WriteLine("0x{0:x8}", a);
        bool b = true;
        b &= false;
        Console.WriteLine(b);
    }
}
/*
Output:
0x00000004
False
*/

See Also

Reference

C# Operators

Concepts

C# Programming Guide

Other Resources

C# Reference