在C#中，使用TcpClient類可以實現客戶端與服務器之間的通信

1. 引入必要的命名空間：

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

2. 創建一個方法來連接到服務器：

public static TcpClient ConnectToServer(string serverAddress, int port)
{
    TcpClient client = new TcpClient();
    try
    {
        client.Connect(serverAddress, port);
        Console.WriteLine("Connected to server.");
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error connecting to server: {ex.Message}");
        client = null;
    }
    return client;
}

3. 創建一個方法來發送和接收數據：

public static void SendAndReceiveData(TcpClient client)
{
    if (client == null)
    {
        Console.WriteLine("Client is not connected.");
        return;
    }

    NetworkStream stream = client.GetStream();
    StreamReader reader = new StreamReader(stream);
    StreamWriter writer = new StreamWriter(stream);

    string dataToSend = "Hello, Server!";
    writer.WriteLine(dataToSend);
    writer.Flush();
    Console.WriteLine($"Sent: {dataToSend}");

    string receivedData = reader.ReadLine();
    Console.WriteLine($"Received: {receivedData}");
}

4. 在主方法中調用這些方法：

public static void Main(string[] args)
{
    string serverAddress = "127.0.0.1"; // 服務器地址
    int port = 8000; // 服務器端口號

    TcpClient client = ConnectToServer(serverAddress, port);
    if (client != null)
    {
        SendAndReceiveData(client);
        client.Close();
    }
}

注意：這只是一個簡單的示例，實際應用中需要考慮更多的錯誤處理和異常情況。同時，為了確保數據傳輸的完整性和安全性，可能需要對數據進行加密或使用其他安全措施。