Answer / jackir

when value of a datatype excided its limitaion then its
call overflow to avoid this problem we use ckecked and
unchecked
syntax
return unchecked(x+y);
return checked(x+y);

Answer / hridya

In a checked context, if the operation is a constant
expression a compile-time error occurs. Otherwise, when the
operation is performed at run-time, a
System.OverflowException is thrown.

In an unchecked context, the result is truncated by
discarding any high-order bits that do not fit in the
destination type.

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