&= Operator
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&= Operator (C# Reference)

The AND 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 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).

// cs_operator_and_assignment.cs
using System;
class MainClass
{
    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
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