Mark code block as checked : checked « Data Type « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Data Type
3. checked

using System;

class MainClass
{
    public static void Main()
    {
        byte val1 = 200;
        byte val2 = 201;
        byte sum = (byte) (val1 + val2);   // no exception
        checked
        {
            byte sum2 = (byte) (val1 + val2);      // exception
        }
    }
}

Unhandled Exception: System.OverflowException: Arithmetic operation resulted in an overflow.
   at MainClass.Main()