C Sharp Programming/Keywords/unchecked

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The unchecked keyword prevents overflow-checking when doing integer arithmetic. It may be used as an operator on a single expression or as a statement on a whole block of code.

int x, y, z;
x = 1222111000;
y = 1222111000;
 
// used as an operator
z = unchecked( x * y );
 
// used as a statement
unchecked {
  z = x * y;
  x = z * z;
}