&= 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
*/