请问如何用C#中的webrequest,webresponse实现断点续传

Question

断点续传首先要服务器支持通常是用socket编写断点续传和多线程下载 (2002年第3期) 
http://www.csdn.net/magazine/download.shtm

Answer 1

但是我如果用socket如何实现？

Answer 2

fileStream = new FileStream(Path,FileMode.Append,FileAccess.Write); 
inStream = null;
try
{

HttpWebRequest myre=(HttpWebRequest)WebRequest.Create(URL);

if(fileStream.Length == myre.ContentLength)
{
MessageBox.Show("你以完成下载该程序了","ok");
return;
}
                     
myre.AddRange(Convert.ToInt32(fileStream.Length));//接上次下载的字节开始下载文件
HttpWebResponse response = (HttpWebResponse)myre.GetResponse();
inStream =response .GetResponseStream();
this.progressBar1.Maximum = total;
this.progressBar1.Minimum =0;
int length = 1024;
byte[] buffer = new byte[1025];
int readerLength = 0,currentLength=0;
while((readerLength =inStream.Read(buffer,0,length))> 0)
{
currentLength +=  readerLength ;
fileStream.Write(buffer,0,readerLength);
this.progressBar1.Value =currentLength + countByte;
}
fileStream.Close();
inStream.Close();
File.Delete(Application.StartupPath +@"\FileLength.txt");
MessageBox.Show("down 成功","ok");socket没玩过！好运吧！！！！！！！！