How to add the numbers 1-12 which = 78 using a loop? :     class Program
    {
        static void Main(string[] args)
       { 
            int sum = 1;

            while (sum < 12)
            {
                sum = sum + 1;
            }

            Console.WriteLine(sum);

            Console.ReadLine();
        }
    }
}

I am new to C# and I have to add the numbers all together. I know adding them up will equal 78 but still don't know how to do it. Any help would be great Thanks!