using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
    class ClearStringBuilder
    {
        static void Main(string[] args)
        {
            int i = 0;
            const int max = 50000000;

            int tick = Environment.TickCount;
            for (i = 0; i < max; i++)
            {
                StringBuilder sb = new StringBuilder("test");
                sb.Clear();
            }
            Console.WriteLine(Environment.TickCount - tick); 

            tick = Environment.TickCount;
            for (i = 0; i < max; i++)
            {
                StringBuilder sb = new StringBuilder("test");
                sb.Remove(0, sb.Length);
            }
            Console.WriteLine(Environment.TickCount - tick);

            tick = Environment.TickCount;
            for (i = 0; i < max; i++)
            {
                StringBuilder sb = new StringBuilder("test");
                string s = sb.ToString();
                sb.Replace(s, "");
            }
            Console.WriteLine(Environment.TickCount - tick);

            tick = Environment.TickCount;
            for (i = 0; i < max; i++)
            {
                StringBuilder sb = new StringBuilder();
                sb.Length = 0;
            }
            Console.WriteLine(Environment.TickCount - tick);
        }
    }
}