using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;

namespace ConsoleApplication2 {
    class Program {
        static string Concat(string s) {
            return "for" + s + "bar" + s + "0123456789" + s + "01234567890123456789" + s + "01234567890123456789";
        }

        static string Builder(string s) {
            StringBuilder sb = new StringBuilder();
            sb.Append("for");
            sb.Append(s);
            sb.Append("bar");
            sb.Append(s);
            sb.Append("0123456789");
            sb.Append(s);
            sb.Append("01234567890123456789");
            sb.Append(s);
            sb.Append("01234567890123456789");
            return sb.ToString();
        }

        static string Format(string s) {
            return string.Format("for{0}bar{1}0123456789{2}01234567890123456789{3}01234567890123456789", s, s, s, s);
        }

        static void Test(Func<string, string> f) {
            Stopwatch sw = new Stopwatch();
            sw.Start();
            for (int m = 0; m < 1000000; m++) {
                var s = f("blablabla");
            }
            sw.Stop();
            Console.WriteLine("{0}: {1} ms", f.GetType().Name, sw.ElapsedMilliseconds);
        }

        static void Main(string[] args) {
            foreach (var method in new Func<string, string>[] { Concat, Builder, Format }) {
                Test(method);
            }
        }
    }
}