class OverFlowTest { // Set maxIntValue to the maximum value for integers. static int maxIntValue = 2147483647; // Using a checked expression. static int CheckedMethod() { int z = 0; try { // The following line raises an exception because it is checked. z = checked(maxIntValue + 10); } catch (System.OverflowException e) { // The following line displays information about the error. Console.WriteLine("CHECKED and CAUGHT: " + e.ToString()); } // The value of z is still 0. return z; } // Using an unchecked expression. static int UncheckedMethod() { int z = 0; try { // The following calculation is unchecked and will not // raise an exception. z = maxIntValue + 10; } catch (System.OverflowException e) { // The following line will not be executed. Console.WriteLine("UNCHECKED and CAUGHT: " + e.ToString()); } // Because of the undetected overflow, the sum of 2147483647 + 10 is // returned as -2147483639. return z; } static void Main() { Console.WriteLine("\nCHECKED output value is: {0}", CheckedMethod()); Console.WriteLine("UNCHECKED output value is: {0}", UncheckedMethod()); } /* Output: CHECKED and CAUGHT: System.OverflowException: Arithmetic operation resulted in an overflow. at ConsoleApplication1.OverFlowTest.CheckedMethod() CHECKED output value is: 0 UNCHECKED output value is: -2147483639 */ }