How to make a C# server?

Question

C++ / C#

Hello! There is a code on C# application server-client.
Here is the server code:
class ClientObject

spoiler

public TcpClient client;
        public ClientObject(TcpClient tcpClient)
        {
            client = tcpClient;
        }

        public void Process()
        {
            NetworkStream stream = null;
            try
            {
                stream = client.GetStream();
                byte[] data = new byte[64]; // буфер для получаемых данных
                while (true)
                {
                    // получаем сообщение
                    StringBuilder builder = new StringBuilder();
                    int bytes = 0;
                    do
                    {
                        bytes = stream.Read(data, 0, data.Length);
                        builder.Append(Encoding.Unicode.GetString(data, 0, bytes));
                    }
                    while (stream.DataAvailable);

                    string message = builder.ToString();

                    Console.WriteLine(message);
                    Console.WriteLine("/");
                    // отправляем обратно сообщение в верхнем регистре
                    message = Console.ReadLine();
                    
                        data = Encoding.Unicode.GetBytes(message);
                    
                        stream.Write(data, 0, data.Length);
                    
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                if (stream != null)
                    stream.Close();
                if (client != null)
                    client.Close();
            }
        }

class Program

spoiler

const int port = 8888;
        static TcpListener listener;
        static void Main(string[] args)
        {
            try
            {
                listener = new TcpListener(port);
                listener.Start();
                Console.WriteLine("Ожидание подключений...");
                
                TcpClient client = listener.AcceptTcpClient();
                ClientObject clientObject = new ClientObject(client);
                Thread clientThread = new Thread(new ThreadStart(clientObject.Process));
                clientThread.Start();
            
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                if (listener != null)
                    listener.Stop();
            }
        }

And here is the client itself:
class Program

spoiler

const int port = 8888;
        const string address = "127.0.0.1";
        static void Main(string[] args)
        {
            Console.Write("Введите свое имя:");
            string userName = Console.ReadLine();
            TcpClient client = null;
            
                client = new TcpClient(address, port);
                NetworkStream stream = client.GetStream();

                while (true)
                {
                    Console.Write(userName + ": ");
                    // ввод сообщения
                    string message = Console.ReadLine();
                    message = String.Format("{0}: {1}", userName, message);
                    // преобразуем сообщение в массив байтов
                    byte[] data = Encoding.Unicode.GetBytes(message);
                    // отправка сообщения
                    stream.Write(data, 0, data.Length);
                    // получаем ответ
                    data = new byte[64]; // буфер для получаемых данных
                    StringBuilder builder = new StringBuilder();
                    int bytes = 0;
                    do
                    {
                        bytes = stream.Read(data, 0, data.Length);
                        builder.Append(Encoding.Unicode.GetString(data, 0, bytes));
                    }
                    while (stream.DataAvailable);

                    message = builder.ToString();
                    Console.WriteLine("Сервер: {0}", message);
                }
            
        }

The very essence of the problem ..
The fact is that when I connect to the server through a client, the server launches a thread for this connection .. When you start another client, another thread comes out, therefore, because of this, I cannot send to all clients the same message. That is, when I enter, it first goes to the first connected client, when I enter the second time, it rushes to the second, etc..
Please tell me how to solve such a problem

Answer 1

So don't create separate threads for each new client connection.
Save connections to an array and send data to all saved connections when needed.

Answer 2

https://metanit.com/sharp/net/4.2.php - everything seems to be written in an accessible way, suddenly it will help.
You can alternatively use an asynchronous TcpListener and not bother with sockets