如何在C#而不是byte中使用TcpClient的字符串？

using System;
using System.IO;
using System.Net.Sockets;
using System.Text;

class TcpClientExample
{
    static void Main()
    {
        TcpClient tcpClient = new TcpClient("localhost", 8001);
        NetworkStream networkStream = tcpClient.GetStream();
        StreamReader streamReader = new StreamReader(networkStream);
        StreamWriter streamWriter = new StreamWriter(networkStream);

        // 发送字符串
        string sendString = "Hello, Server!";
        streamWriter.WriteLine(sendString);
        streamWriter.Flush();

        // 接收字符串
        string receiveString = streamReader.ReadLine();
        Console.WriteLine("Received: " + receiveString);

        // 关闭连接
        tcpClient.Close();
    }
}