loop with letter char as the control variable
using System; using System.Collections.Generic; using System.Text; class Program { static void Main(string[] args) { string greetingText = "www.java2s.com"; for (int i = (int)'z'; i >= (int)'a'; i--) { char old1 = (char)i; char new1 = (char)(i + 1); greetingText = greetingText.Replace(old1, new1); } for (int i = (int)'Z'; i >= (int)'A'; i--) { char old1 = (char)i; char new1 = (char)(i + 1); greetingText = greetingText.Replace(old1, new1); } Console.WriteLine("Encoded:\n" + greetingText); } }