Asp.net(c#)实现多线程断点续传

以前一直错误的认为在ASP.NET中无法通过编程方式实现多线程断点续传，今天终于获得了这样一个解决方案，让我明白要学习的东西还很多 。
此解决方案基于其它解决方案及相关资料，根据我自己的理解改进.如有错漏，请尽管指出 ;如有其它更好的解决方案，请推荐一下 ，感谢先。

System.IO.StreamiStream = null ;

// Buffertoread10Kbytesinchunk:
byte []buffer = new Byte[ 10240 ];

// Lengthofthefile:
int length;

// Totalbytestoread:
long dataToRead;

// Identifythefiletodownloadincludingitspath.
string filepath = @" E:/software/SQLServer2000PersonalEdition.ISO " ;

// Identifythefilename.
string filename = System.IO.Path.GetFileName(filepath);

try
{
//Openthefile.
iStream=newSystem.IO.FileStream(filepath,System.IO.FileMode.Open,
System.IO.FileAccess.Read,System.IO.FileShare.Read);
Response.Clear();

//Totalbytestoread:
dataToRead=iStream.Length;

longp=0;
if(Request.Headers["Range"]!=null)
{
Response.StatusCode=206;
p=long.Parse(Request.Headers["Range"].Replace("bytes=","").Replace("-",""));
}
if(p!=0)
{
Response.AddHeader("Content-Range","bytes"+p.ToString()+"-"+((long)(dataToRead-1)).ToString()+"/"+dataToRead.ToString());
}
Response.AddHeader("Content-Length",((long)(dataToRead-p)).ToString());
Response.ContentType="application/octet-stream";
Response.AddHeader("Content-Disposition","attachment;filename="+System.Web.HttpUtility.UrlEncode(Request.ContentEncoding.GetBytes(filename)));

iStream.Position=p;
dataToRead=dataToRead-p;
//Readthebytes.
while(dataToRead>0)
{
//Verifythattheclientisconnected.
if(Response.IsClientConnected)
{
//Readthedatainbuffer.
length=iStream.Read(buffer,0,10240);

//Writethedatatothecurrentoutputstream.
Response.OutputStream.Write(buffer,0,length);

//FlushthedatatotheHTMLoutput.
Response.Flush();

buffer=newByte[10240];
dataToRead=dataToRead-length;
}
else
{
//preventinfiniteloopifuserdisconnects
dataToRead=-1;
}
}
}
catch (Exceptionex)
{
//Traptheerror,ifany.
Response.Write("Error:"+ex.Message);
}
finally
{
if(iStream!=null)
{
//Closethefile.
iStream.Close();
}
Response.End();
}

本解决方案所参考的资料链接列表(在此对作者表示感谢)：
http://blog.youkuaiyun.com/playyuer/archive/2004/08/02/58430.aspx
http://www.httpsniffer.com/http/1416.htm
http://support.microsoft.com/default.aspx?scid=kb;en-us;812406&Product=aspnet