Boolean isConnect= false; // we use this Boolean to know if we are connected
private void Connect_Click(object sender,EventArgs e)
{
    try
    {
        w1.Close(); // close the winsock in case it was open

        // now is time to connect ;-))
        // ipText and portText is textbox
        // in ipText the user is write the host ip
        // in portText the user is write the host port
        // (BUT client and host MUST use the same port )
        // if the server accept the connection the w1_connect event is raised
        w1.Connect(IPText.Text, PortText.Text);

    }
    // with try - catch we take all the exception that maybe come and write it to the screen
    catch (System.Windows.Forms.AxHost.InvalidActiveXStateException g)
    { 
        DataInput.Text += "\n" + g.ToString(); 
    }
}

private void Send_Click(object sender, EventArgs e)
{
    try
    {
        if (isConnect)
        {
            //this will send the data that we wrote in SendText textbox
            w1.SendData(SendText.Text);

            //we add what we said to screen
            DataInput.Text += "\nClent(You ;-) : " + SendText.Text;

            //after we send the data we clear the textbox
            SendText.Text = "";
        }
        else
            MessageBox.Show("You are not connect to any host ");
    }
    // with try - catch we take all the exception that maybe come and write it to the screen
    catch (AxMSWinsockLib.AxWinsock.InvalidActiveXStateException g)
    {
        DataInput.Text += "\n" + g.ToString(); 
    }
    catch (Exception ex) 
    { 
        DataInput.Text +="\n" + ex.Message; 
    }
}

this.w1.Error += new AxMSWinsockLib.DMSWinsockControlEvents_ErrorEventHandler(this.w1_Error);
this.w1.ConnectEvent +=new System.EventHandler(this.w1_ConnectEvent);
this.w1.DataArrival += new AxMSWinsockLib.DMSWinsockControlEvents_DataArrivalEventHandler(this.w1_DataArrival);

// in case of any errors ( like when the host don't accept your connection request)
// this event raises and the e.number and e.description hold the errors info
void w1_Error(object sender, AxMSWinsockLib.DMSWinsockControlEvents_ErrorEvent e)
{
    DataInput.Text += "\n- Error : " + e.description;
    isConnect = false;
}

// when the server sends any data this event raises
private void w1_DataArrival(object sender, AxMSWinsockLib.DMSWinsockControlEvents_DataArrivalEvent e)
{
    // data is the variable that store the incoming msgbox
    String data ="";

    // dat is variable type object
    // the method getData of Winsock take only general type object
    // and we input data in the variable to use it next time by ref
    Object dat = (object)data;


    // with this command the data are
    // being stored in the dat variable so
    // we can use them.
    w1.GetData(ref dat);


    // change back the object dat to string
    data = (String)dat;


    // write data to the screen
    // (adding a host ip in front of the string to know where this came from :o)
    DataInput.Text += "\nServer - " + w1.RemoteHostIP + " : " + data ;

}


private void w1_ConnectEvent(object sender, EventArgs e)
{
    //there we write what we what our program to do
    //when the connection with the host is established
    //w1.remotehostip is a function that will return as the hosts ip
    DataInput.Text += "\n - Connect Event : " + w1.RemoteHostIP;


    isConnect = true;
}

private void Start_Click(object sender, EventArgs e)
{
    if (portText.Text != "")
    {
        //to create a connection we need a server(host).
        //server we call the program that keeps a port open
        //so the someone ( client ) can connect
        //do open the port we must write the following code


        //with this we set the port we want to use for .the connection
        w1.LocalPort = Int32.Parse(portText.Text);

        //this command opens the port and waits (listens) for a connection
        w1.Listen();
    }
}

private void Disconnect_Click(object sender, EventArgs e)
{
    w1.Close();//this will close the connection with the client
    w1.LocalPort = Int32.Parse(portText.Text);
    w1.Listen();//open the port to wait for another connection
    DataInput.Text += "\n - Disconnected";
}

//this event is called when a client request a connection with the server
private void w1_ConnectionRequest(object sender,......AxMSWinsockLib.DMSWinsockControlEvents_ConnectionRequestEvent e)
{
    if (isConnected==true )
    {
        w1.Close ();
    }

    //with this commands we accept the connection request to the server..
    w1.Accept (e.requestID );
    isConnected =true;
    //now we are connected with the client
    DataInput.Text +="\n - Client Connected :" + w1.RemoteHostIP ;
}