protected void play3()
  

  {
  

  string fileName = "aaa.f4v";
  

  string fullFilePath = Server.MapPath("VTS_02_1.f4v");//路径
  

  byte[] buffer;
  

  

  using (FileStream fileStream = new FileStream(fullFilePath, FileMode.Open))
  

  {
  

  int fileSize = (int)fileStream.Length;
  

  

  buffer = new byte[fileSize];
  

  

  fileStream.Read(buffer, 0, (int)fileSize);
  

  }
  

  

  Response.Clear();
  

  Response.ClearContent();
  

  Response.ClearHeaders();
  

  

  Response.Buffer = true;
  

  Response.BufferOutput = true;
  

  Response.ContentType = "video/mp4";
  

  Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);
  

  Response.CacheControl = "public";
  

  // writes buffer to OutputStream
  

  Response.OutputStream.Write(buffer, 0, buffer.Length);
  

  Response.Flush();
  

  Response.End();
  

  }