c# – 如何找到一个asp.net客户端是immidiately断开连接

// sample code for sending a dynamic file in chuncks

long bytesSent = 0;

while (continueSending)
   {
      if (!AskReceiverToContinue())
         break;

      if (!Response.IsClientConnected)
         break;

     // Your suggestion goes here... :)

      try
      {
         Response.OutputStream.Write(buffer,buffer.Length);
         bytesSent += buffer.Length;
      }
      Catch
      {  // To my experience,this is more reliable than Response.IsClientConnected
         continueSending = false;
      }
   }

问题是客户端实际接收的字节数量远小于我的bytesSent.似乎当客户端断开连接时,我的程序发现了一个很大的滞后情况(并继续增加bytesSent),这是因为ASP.NET告诉我情况(客户端断开连接)很晚.

是否有任何可靠的方法可以找出客户端何时断开连接(实时)？