private void btSend_Click(object sender, System.EventArgs e)

　{

　if (this._isConnect)

　{

　_ns = _tc.GetStream();

　string path = this.txtPath.Text.Trim();

　FileStream fs = new FileStream(path, FileMode.Open);

　int sendCount = 0;

　byte[] countbuffer = null;

　byte[] clientbuffer = new byte[1004];

　while (sendCount < fs.Length && _ns.CanWrite)

　{

　int count = fs.Read(_sendBuf, 0, _sendBuf.Length);  //读出要发送的数据

　countbuffer = BitConverter.GetBytes(count);

　countbuffer.CopyTo(clientbuffer,0);

　_sendBuf.CopyTo(clientbuffer, 4);

　this._ns.Write(clientbuffer, 0, 4 + count);          //写入网络流

　sendCount += count;

　}

　countbuffer = BitConverter.GetBytes(0);                //发送完文件后 发送count = 0

　this._ns.Write(countbuffer, 0, countbuffer.Length);    //使接收端停止

　_ns.Close();

　fs.Close();

　}

　}