What is the difference between checked and unchecked?

Question

What is the difference between

checked(a + b)

and

unchecked(a + b)

?

Answer 1

Those are operators that check (or do not check) for overflow in the resulting numerical operation. In the checked case, an OverflowException exception is raised if the result of the operation exceeds the minimum or maximum value allowed for the datatype.

More information is available from MSDN.

Answer 2

It controls overflow checking for integer operations.

Answer 3

if a + b is larger than the maximum value of the datatype, checked will throw an exception. Unchecked will roll the overflow of the value and add it to zero.