Screengrab a website c#

gistfile1.txt

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Threading;
using System.Windows.Forms;

namespace ScreenGrab.Core.Helpers
{
    /// <summary>
    /// Create a screenshot .png of a remote webpage
    /// Implemented with this link in mind: http://stackoverflow.com/questions/2715385/convert-webpage-to-image-from-asp-net
    /// </summary>
    public class WebsiteToImage : IDisposable
    {
        private Bitmap _bitmap;

        private readonly string _url;
        private readonly bool _useBodyHeight;
        private readonly int _width = 1800;
        private int _height = 1400;

        public WebsiteToImage(string url)
        {
            _url = url;
        }

        public WebsiteToImage(string url, int width, int height, bool useBodyHeight) : this(url)
        {
            _width = width;
            _height = height;

            _useBodyHeight = useBodyHeight;
        }

        public Bitmap Generate()
        {
            var thread = new Thread(_Generate);

            thread.SetApartmentState(ApartmentState.STA);
            thread.Start();
            thread.Join();

            return _bitmap;
        }

        private void _Generate()
        {
            /* [ML] - It is possible to tell windows which rendering compatibility to use while running the WebBrowser.
               http://weblog.west-wind.com/posts/2011/May/21/Web-Browser-Control-Specifying-the-IE-Version */

            using (var browser = new WebBrowser {ScrollBarsEnabled = false, ScriptErrorsSuppressed = true})
            {
                browser.Navigate(_url);
                browser.DocumentCompleted += WebBrowser_DocumentCompleted;

                while (browser.ReadyState != WebBrowserReadyState.Complete)
                {
                    Application.DoEvents();
                }
            }
        }

        private void WebBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            var browser = (WebBrowser)sender;

            if (browser != null && e.Url == browser.Url)
            {
                if (browser?.Document?.Body != null)
                {
                    if (_useBodyHeight)
                    {
                        _height = browser.Document.Body.ScrollRectangle.Height;
                    }

                    browser.ClientSize = new Size(_width, _height);

                    _bitmap = new Bitmap(_width, _height);

                    browser.BringToFront();
                    browser.DrawToBitmap(_bitmap, browser.Bounds);
                }
            }
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        ~WebsiteToImage()
        {
            Dispose(false);
        }

        // The bulk of the clean-up code is implemented in Dispose(bool)
        protected virtual void Dispose(bool disposing)
        {
            if (disposing)
            {
                _bitmap.Dispose();
            }
        }
    }
}