using System;
using System.Windows.Forms;
using System.Diagnostics;

namespace PortalLogin2
{
    public partial class Form1 : Form
    {

        bool mHooked;

        public Form1()
        {
            InitializeComponent();
            webBrowser1.DocumentCompleted += webBrowser1_DocumentCompleted;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string input = "https://en-gb.facebook.com/";
            Process.Start(input);
        }
        void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            if (mHooked) return;

            HtmlDocument doc = webBrowser1.Document;

            HtmlElement username = doc.GetElementById("email");
            HtmlElement password = doc.GetElementById("pass");
            HtmlElement submit = doc.GetElementById("u_0_");

            string txtUser = "insert username here";
            string txtPass = "insert password here";
            doc.GetElementById("email").InnerText = txtUser.ToString();
            doc.GetElementById("pass").InnerText = txtPass.ToString();

            submit.InvokeMember("click");
            mHooked = true;
        }

    }

}