C#测试代码段运行速度

           Stopwatch sw = new Stopwatch();

　　　　sw.Start();

            int sum = 0;
            for (int i = 0; i < 100000; i++)
            {
                sum += i;
            }
            sw.Stop();
            Label1.Text = "for循环：<br/>" + sw.Elapsed.ToString() + "<br/>";
            sw.Reset();

            sw.Start();
            sum = 0;
            int m = 100000;
            while (m != 0)
            {
                sum += m;
                m--;
            }
            sw.Stop();
            Label1.Text += "while循环：<br/>" + sw.Elapsed.ToString() + "<br/>";