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Adding extension to Stream

using System.ComponentModel; using System.IO; using System.Net;     public static class StreamUtilWithExtensions     {         const int BufferSize = 8192;         public static void CopyTo(this Stream input,Stream output)         {             byte[] buffer = new byte[BufferSize];             int read;             while ((read = input.Read(buffer, 0, buffer.Length)) > 0)             {                 output.Write(buffer, 0, read);             }         }         public static byte[] ReadFully(this Stream input)         {             using (MemoryStream tempStream = new MemoryStream())             {                 CopyTo(input, tempStream);                 if (tempStream.Length == tempStream.GetBuffer().Length)                 {                     return tempStream.GetBuffer();                 }                 return tempStream.ToArray();             }         }     }     class MainClass     {         static void Main()         {             WebRequest request = WebRequest.Create("http://rntsoft.com");             using (WebResponse response = request.GetResponse())             using (Stream responseStream = response.GetResponseStream())             using (FileStream output = File.Create("data.dat"))             {                 responseStream.CopyTo(output);             }         }     }