1~100的整数和

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            int i = 1,s=0;            while (i <= 100)            {                s += i;                i++;            }            Console.WriteLine(s);            Console.ReadLine();        }    }}