using System; public class MainClass { public static void Main(string[] args) { string sSentence = ""; for (; ; ) { Console.WriteLine("Enter a string"); string sLine = Console.ReadLine(); if (IsTerminateString(sLine)) { break; } sSentence = String.Concat(sSentence, sLine); Console.WriteLine(" You've entered: {0}", sSentence); } } public static bool IsTerminateString(string source) { string[] sTerms = {"EXIT","exit","QUIT","quit"}; foreach (string sTerm in sTerms) { if (String.Compare(source, sTerm) == 0) { return true; } } return false; } }