C#中 socket网络编程

刚开始学，还不能理解socket中的Tcp和Udp的区别和分布的连接方式，希望哪位大虾能够帮我把下面的这个TCP连接换成udp连接，谢谢。
 private void StartReceive()
        {
            //创建一网络端点,指定默认连接端口为8484
            IPEndPoint serveripendpoint = new IPEndPoint(IPAddress.Any,int.Parse("8484"));
            //创建套接字
            Socket server = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
            //绑定套接字到端口
            //server.Bind(serveripendpoint);
            ////监听并阻塞
            //server.Listen(8484);
            TcpListener listen = new TcpListener(serveripendpoint);
            try
            {
                listen.Start();
                MessageBox.Show("接收端准备好接收文件了!");
            }
            catch(Exception e)
            {
                MessageBox.Show(e.ToString());
            }
            Socket client = listen.AcceptSocket();
            //创建发送端节点
            IPEndPoint clientipendpoint = (IPEndPoint)client.RemoteEndPoint;
            //文件名
            string SendFileName = Encoding.Unicode.GetString(ReceiveVarData(client));
            //包大小
            string bagSize = Encoding.Unicode.GetString(ReceiveVarData(client));
            //预期接收的包数量
            int bagCount = int.Parse(Encoding.Unicode.GetString(ReceiveVarData(client)));
            //最后一个包的大小
            string bagLast = Encoding.Unicode.GetString(ReceiveVarData(client));
            //将文件写入到bin/debug文件夹下面（默认）
            FileStream myfile = new FileStream(SendFileName,FileMode.Create,FileAccess.Write);
            //已接收包的数量
            int SendedCount = -1;
            while(true)
            {
                byte[] data = ReceiveVarData(client);
                if (data.Length == 0)
                {
                    break;
                }
                else
                {
                    //将收到的数据包写入到刚刚创建的文件流对象myfile中
                    myfile.Write(data,0,data.Length);
                    SendedCount=SendedCount+1;
                }
            }
            /*关闭文件流和套接字*/
            MessageBox.Show("接收完成!");
            myfile.Close();
            listen.Stop();
            client.Close();
            //将接受到得文件信息绑定到dgv中
            this.dgv_AcceptFileDetail.Rows.Add(bagSize, clientipendpoint.Address, SendedCount, SendFileName, bagCount, bagLast);
        }        //关闭
        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Close();
        }