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//csharpusing System.IO;using System.Net;using System.Net.Sockets;
public static void Main(){    var client = new TcpClient();    client.Connect("localhost", 8080);    using var stream = client.GetStream();    using var fileStream = File.OpenRead("path_to_file");    var bytesToSend = new byte[fileStream.Length];    fileStream.Read(bytesToSend, 0, bytesToSend.Length);    stream.Write(bytesToSend, 0, bytesToSend.Length);    client.Close();}

//csharpusing System.IO;using System.Net;using System.Net.Sockets;
public static void Main(){    var listener = new TcpListener(IPAddress.Any, 8080);    listener.Start();    while (true)    {        var client = listener.AcceptTcpClient();        var stream = client.GetStream();        using var memoryStream = new MemoryStream();        stream.CopyTo(memoryStream);        var bytesReceived = memoryStream.ToArray();        File.WriteAllBytes("path_to_save_file", bytesReceived);        client.Close();    }}