Direction needed. I want to build a Semi-automatic Web browser in C#

    using System;
    using System.Net;
    using System.Net.Security;
    using System.Security.Cryptography.X509Certificates;
    public class WebClientEx : WebClient
    {
        static WebClientEx()
        {
            ServicePointManager.Expect100Continue = false;
            //Ignore certificate errors
            ServicePointManager.ServerCertificateValidationCallback = (RemoteCertificateValidationCallback)((object sender,
            X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) => true);
            //This line is very important for multithreading
            //by default you can have up to 2 simultaneous connections, no matter how many threads you are creating
            ServicePointManager.DefaultConnectionLimit = 1000;
        }


        public WebClientEx()
            : base()
        {
            this.AllowAutoRedirect = true;
            this.Cookies = new CookieContainer();
        }
        
        protected override WebRequest GetWebRequest(Uri address)
        {
            //You can add other headers too
            HttpWebRequest request = base.GetWebRequest(address) as HttpWebRequest;
            if (request.Method == "POST")
            {
                request.ContentType = "application/x-www-form-urlencoded";
            }
            //the webclient will handle GZip and Defalte compressions automatically, improves the performance a lot
            request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
            request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.12) Gecko/20101026 Firefox/3.6.12";
            request.CookieContainer = this.Cookies;
            request.Timeout = 10000;
            return request;
        }
        
        //Add cookie support
        public CookieContainer Cookies { get; set; }
    }

WebClientEx web = new WebClientEx();
string htmlGet = web.DownloadString("yoururl");
string htmlPost = web.UploadString("yoururl", "yourpostdata");
byte[] dataGet = web.DownloadData("yoururl");
byte[] dataPost = web.UploadData("yoururl", Encoding.UTF8.GetBytes("yourpostdata"));

PM> Install-Package Microsoft.Net.Http

PM> Install-Package HttpClient -Version 0.3.0

PM> Install-Package HttpClient -Version 0.5.0