using System;

public class program

{

    public static void Main()

    {

        string str1,str2,x;

        int l,i;

       Console.Write("Input the string : ");

       str1 = Console.ReadLine();

       l=str1.Length;

        Console.Write("String in reverse order is: ");

        for(i=l-1; i >= 0; i--)

          {

              Console.Write(str1[i]);

          }

         Console.WriteLine("\nSub String1: " + str1.Substring(1, l-1));

         Console.Write("Input the character that you want to replace : ");

         x=Console.ReadLine();

        Console.WriteLine("NewString: " + str1.Replace(x,"$")); 

        str2=String.Copy(str1);

        Console.WriteLine("Original string "+str1); 

        Console.WriteLine("NewString: "+str2.ToUpper()); 

        Console.Write("\n\n");    

   }

}

​