string sendStr = "hello!This is a socket test";
                byte[] bs = Encoding.ASCII.GetBytes(sendStr);//把字符串编码为字节
                Console.WriteLine("发送信息.....");
                c.Send(bs, bs.Length, 0);//发送信息


那我用中文传输怎样实现

Socket c = s.Accept();
NetworkStream ns = new NetworkStream(c);
StreamReader sr = new StreamReader(ns);

Console.WriteLine(sr.ReadLine());

是这样吗？？？

可以用数据流或内存流方法传送