Keywords - checked & unchecked

First understand scenarios where we can use checked & unchecked keywords

C# compiler does not throws any error at compile or run time for arithmetic overflow.
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checked:  Used to check arithmetic overflow, it throws arithmetic overflow exception in case of overflow.

C# compiler checks for arithmetic overflow if constant(s) involved in operation and gives compile time error.

unchecked: unchecked is used to suppress checking for arithmetic overflow by compiler