C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using NetworksApi.TCP.SERVER;
using System.IO;
using System.Net;

namespace AdvanceServer
{
    public delegate void UpdateChatLog(string txt);
    public delegate void UpdateListBox(ListBox box,string value, bool Remove);

    public partial class Form1 : Form
    {
        Server server;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            server = new Server("192.168.1.6","90");
            server.OnClientConnected += new OnConnectedDelegate(server_OnClientConnected);
            server.OnClientDisconnected += new OnDisconnectedDelegate(server_OnClientDisconnected);
            server.OnDataReceived += new OnReceivedDelegate(server_OnDataReceived);
            server.OnServerError += new OnErrorDelegate(server_OnServerError);
            server.Start();
        }

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using NetworksApi.TCP.CLIENT;
using System.IO;
using System.Net;

namespace AdvancedClient
{
    public delegate void UpdateText(string txt);
    public partial class Form1 : Form
    {
        Client client;
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {

        }
        private void ChangeTextBox(string txt)
        { 
            if (textBox1.InvokeRequired)
            {
                Invoke(new UpdateText(ChangeTextBox), new object[] { txt });
            }
            else
            {
                textBox1.Text += txt + "\r\n";
            }
        }
        private void button3_Click(object sender, EventArgs e)
        {
            if (textBox3.Text != "" && textBox4.Text != "" && textBox5.Text != "")
            {
                client = new Client();
                client.ClientName = textBox4.Text;
                client.ServerIp = textBox3.Text;
                client.ServerPort = textBox5.Text;

                client.OnClientConnected += new OnClientConnectedDelegate(client_OnClientConnected);
                client.OnClientConnecting += new OnClientConnectingDelegate(client_OnClientConnecting);
                client.OnClientDisconnected += new OnClientDisconnectedDelegate(client_OnClientDisconnected);
                client.OnClientError += new OnClientErrorDelegate(clien_OnClientError);
                client.OnClientFileSending += new OnClientFileSendingDelegate(client_OnClientFileSending);
                client.OnDataReceived += new OnClientReceivedDelegate(client_OnDataReceived);

                client.Connect();
            }
            else
            {
                MessageBox.Show("E' obbligatorio completare tutti i campi");
            }
        }