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&= Operator (C# Reference)

Visual Studio 2008

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).

```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
*/
```