using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;                   

public class Program

{

    public static void Main()

    {

         //string myString = "My \"so-called\" life";

            //string myString = "What if I need a\nnew line?";

            //string myString = "Go to your c:\\ drive";

            //string myString = @"Go to your c:\ drive";

​

            //string myString = String.Format("{1} = {0}", "First", "Second");

​

            //string myString = string.Format("{0:C}", 123.45);

            //string myString = string.Format("{0:N}", 1234567890);

            //string myString = string.Format("Percentage: {0:P}", .123);

            //string myString = string.Format("Phone Number: {0:(###) ###-####}", 123456789012);

​

            //string myString = " That summer we took threes across the board  ";

​

            //myString = myString.Substring(6, 14);

            //myString = myString.ToUpper();

            //myString = myString.Replace(" ", "--");

            //myString = myString.Remove(6, 14);

​

            /*

            myString = String.Format("Length before: {0} -- Length after: {1}",

                myString.Length, 

                myString.Trim().Length);

            */

​

            /*

            string myString = "";

            for (int i = 0; i < 100; i++)

            {

                myString += "--" + i.ToString();

            }

            */

​

            StringBuilder myString = new StringBuilder();

​

            for (int i = 0; i < 100; i++)

            {

                myString.Append("--");

                myString.Append(i);

            }

​

            Console.WriteLine(myString);

            Console.ReadLine();

        }

    }

​