using System;

public class Program

{

    public static void Main()

    {

        int sum1=0;

        int number1 = 11;                                           

        while (number1 < 11)                                   

        {                                                                 

            //Console.WriteLine(number);

            sum1 = sum1+number1;

            number1++;                                               

        }

        Console.WriteLine("sum: {0} (while example) ", sum1);

        int sum2=0;

        int number2 = 11;                                           

        do 

        {                                                                 

            //Console.WriteLine(number);

            sum2 = sum2+number2;

            number2++;                                               

        } while (number2 < 11);

        Console.WriteLine("sum: {0} (do while example) ", sum2);

    }

}

​