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<<= Operator (C# Reference)
The left-shift assignment operator.
An expression of the form
is evaluated as
except that x is only evaluated once. The << operator shifts x left by the number of bits specified by y.
The <<= operator cannot be overloaded directly, but user-defined types can overload the << operator (see operator).
static void Main()
int a = 1000;
a <<= 4;