Windows Forms: TCP/IP Client & Server in C#

Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "TCPIPDemo" and then click OK. Similar with "Client" project

Step 2: Right click on your project select Manage NuGet Packages -> Search simpletcp -> Install

Step 3: Design your form as below

Client

Server

You can change the host and port to connect over the network, connect through the network you should open the firewall to allow connection to your port

Add code to handle client form

namespace Client
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        SimpleTcpClient client;

        private void btnConnect_Click(object sender, EventArgs e)
        {
            btnConnect.Enabled = false;
            //Connect to server
            client.Connect(txtHost.Text, Convert.ToInt32(txtPort.Text));
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            client = new SimpleTcpClient();
            client.StringEncoder = Encoding.UTF8;
            client.DataReceived += Client_DataReceived;
        }

        private void Client_DataReceived(object sender, SimpleTCP.Message e)
        {
            //Update message to txtStatus
            txtStatus.Invoke((MethodInvoker)delegate ()
            {
                txtStatus.Text += e.MessageString;                
            });
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            client.WriteLineAndGetReply(txtMessage.Text, TimeSpan.FromSeconds(3));
        }
    }
}

Add code to handle server form

namespace TCPIPDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        SimpleTcpServer server;
        private void Form1_Load(object sender, EventArgs e)
        {
            server = new SimpleTcpServer();
            server.Delimiter = 0x13;//enter
            server.StringEncoder = Encoding.UTF8;
            server.DataReceived += Server_DataReceived;
        }

        private void Server_DataReceived(object sender, SimpleTCP.Message e)
        {
            //Update mesage to txtStatus
            txtStatus.Invoke((MethodInvoker)delegate ()
            {
                txtStatus.Text += e.MessageString;
                e.ReplyLine(string.Format("You said: {0}", e.MessageString));
            });
        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            //Start server host
            txtStatus.Text += "Server starting...";
            System.Net.IPAddress ip = System.Net.IPAddress.Parse(txtHost.Text);
            server.Start(ip, Convert.ToInt32(txtPort.Text));
        }

        private void btnStop_Click(object sender, EventArgs e)
        {
            if (server.IsStarted)
                server.Stop();
        }
    }
}

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