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StringReaderWriter App

using System; using System.Collections.Generic; using System.Text; using System.IO;   class Program   {     static void Main(string[] args)     {       using (StringWriter strWriter = new StringWriter())       {         strWriter.WriteLine("A");         Console.WriteLine(strWriter);         StringBuilder sb = strWriter.GetStringBuilder();         sb.Insert(0, "Hey!! ");         Console.WriteLine("-> {0}", sb.ToString());         sb.Remove(0, "Hey!! ".Length);         Console.WriteLine("-> {0}", sb.ToString());         using (StringReader strReader = new StringReader(strWriter.ToString()))         {           string input = null;           while ((input = strReader.ReadLine()) != null)           {             Console.WriteLine(input);           }         }       }     }   }