I Make a Video Streamer But it's not Seekable

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C#

ASP.NET

ASHX

Hi i Make this ASHX class :

private void RangeDownload(string fullpath,HttpContext context)
   {
       long size,start,end,length,fp=0;
       using (StreamReader reader = new StreamReader(fullpath))
       {

           size = reader.BaseStream.Length;
           start = 0;
           end = size - 1;
           length = size;
           // Now that we've gotten so far without errors we send the accept range header
           /* At the moment we only support single ranges.
            * Multiple ranges requires some more work to ensure it works correctly
            * and comply with the spesifications: http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html#sec19.2
            *
            * Multirange support annouces itself with:
            * header('Accept-Ranges: bytes');
            *
            * Multirange content must be sent with multipart/byteranges mediatype,
            * (mediatype = mimetype)
            * as well as a boundry header to indicate the various chunks of data.
            */
           context.Response.AddHeader("Accept-Ranges", "0-" + size);
           // header('Accept-Ranges: bytes');
           // multipart/byteranges
           // http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html#sec19.2

           if (!String.IsNullOrEmpty(context.Request.ServerVariables["HTTP_RANGE"]))
           {
               long anotherStart = start;
               long anotherEnd = end;
               string[] arr_split = context.Request.ServerVariables["HTTP_RANGE"].Split(new char[] { Convert.ToChar("=") });
               string range = arr_split[1];

               // Make sure the client hasn't sent us a multibyte range
               if (range.IndexOf(",") > -1)
               {
                   // (?) Shoud this be issued here, or should the first
                   // range be used? Or should the header be ignored and
                   // we output the whole content?
                   context.Response.AddHeader("Content-Range", "bytes " + start + "-" + end + "/" + size);
                   throw new HttpException(416, "Requested Range Not Satisfiable");

               }

               // If the range starts with an '-' we start from the beginning
               // If not, we forward the file pointer
               // And make sure to get the end byte if spesified
               if (range.StartsWith("-"))
               {
                   // The n-number of the last bytes is requested
                   anotherStart = size - Convert.ToInt64(range.Substring(1));
               }
               else
               {
                   arr_split = range.Split(new char[] { Convert.ToChar("-") });
                   anotherStart = Convert.ToInt64(arr_split[0]);
                   long temp = 0;
                   anotherEnd = (arr_split.Length > 1 && Int64.TryParse(arr_split[1].ToString(), out temp)) ? Convert.ToInt64(arr_split[1]) : size;
               }
               /* Check the range and make sure it's treated according to the specs.
                * http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
                */
               // End bytes can not be larger than $end.
               anotherEnd = (anotherEnd > end) ? end : anotherEnd;
               // Validate the requested range and return an error if it's not correct.
               if (anotherStart > anotherEnd || anotherStart > size - 1 || anotherEnd >= size)
               {

                   context.Response.AddHeader("Content-Range", "bytes " + start + "-" + end + "/" + size);
                   throw new HttpException(416, "Requested Range Not Satisfiable");
               }
               start = anotherStart;
               end = anotherEnd;

               length = end - start + 1; // Calculate new content length
               fp = reader.BaseStream.Seek(start, SeekOrigin.Begin);
               context.Response.StatusCode = 206;
           }
       }
           // Notify the client the byte range we'll be outputting
           context.Response.AddHeader("Content-Range", "bytes " + start + "-" + end + "/" + size);
           context.Response.AddHeader("Content-Length", length.ToString());
           // Start buffered download
           //context.Response.WriteFile(fullpath, fp, length);
           long fileLength = length;
                   //context.Response.WriteFile(fullpath);
           using (FileStream fileStream = new FileStream(fullpath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
           {
               try
               {

                   fileStream.Seek(fp, SeekOrigin.Begin);
                   Byte[] buffer = new Byte[10240];
                   // Send file to client.
                   while (fileLength > 0)
                   {
                       if (context.Response.IsClientConnected)
                       {
                           int lengthBuff = fileStream.Read(buffer, 0, 10240);

                           context.Response.OutputStream.Write(buffer, 0, lengthBuff);

                           context.Response.Flush();

                           fileLength = fileLength - lengthBuff;
                       }
                       else
                       {
                           fileLength = -1;
                       }
                   }
               }
               catch (HttpException ex)
               {
                   context.Response.StatusCode = ex.GetHttpCode();
               }
               finally
               {
                   fileStream.Close();
               }
           }
           context.Response.End();

   }

   public void ProcessRequest(HttpContext context)
   {
       //context.Response.Headers.Clear();
       string filename = context.Request["fn"];
       string mimetype = "video/mp4";
       string fullpath=("E:/"+filename);
       if (System.IO.File.Exists(fullpath))
       {

           context.Response.ContentType = mimetype;
           if (!String.IsNullOrEmpty(context.Request.ServerVariables["HTTP_RANGE"]))
           {
               //request for chunk
               RangeDownload(fullpath,context);
           }
           else
           {
               //ask for all
                   //context.Response.WriteFile(fullpath);
                   using (FileStream fileStream = new FileStream(fullpath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)){
                     try
                     {
                         long fileLength = fileStream.Length;
                         context.Response.AddHeader("Content-Length", fileLength.ToString());
                         Byte[] buffer = new Byte[10240];
                         // Send file to client.
                         while (fileLength > 0)
                         {
                             if (context.Response.IsClientConnected)
                             {
                                 int length = fileStream.Read(buffer, 0, 10240);

                                 context.Response.OutputStream.Write(buffer, 0, length);

                                 context.Response.Flush();

                                 fileLength = fileLength - length;
                             }
                             else
                             {
                                 fileLength = -1;
                             }
                         }
                     }
                     catch (HttpException ex)
                     {
                         context.Response.StatusCode = ex.GetHttpCode();
                     }
                     finally
                     {
                         fileStream.Close();
                     }

                 }

           }
       }
       else
       {
           throw new HttpException(404, "Video Not Found Path:"+fullpath);
       }
   }

   public bool IsReusable {
       get {
           return false;
       }
   }

and then i call it in mediaelement in WPF like this :

mediaElement.Source = new Uri("http://localhost:3402/VideoStreamer.ashx?fn=a.mp4");
              mediaElement.Play();

But my problem is it not seekable and i can't change position my video.
Where is My Problem ?
Thank You.