private void FetchDataAdd()
        {
            Regex urlRegex         = new Regex(@"(https|http)://(www.)?.+?\.\w+");
            Regex proshopUrlRegex  = new Regex(@"(https|http)://(www.)?proshop\.dk");
            Regex komplettUrlRegex = new Regex(@"^(https|http)://(www.)?komplett\.dk");

            if (!string.IsNullOrEmpty(AddProductUrlTextBox.Text))
            {
                if (urlRegex.IsMatch(AddProductUrlTextBox.Text))
                {
                    if (proshopUrlRegex.IsMatch(AddProductUrlTextBox.Text) || komplettUrlRegex.IsMatch(AddProductUrlTextBox.Text))
                    {
                        var    dl = new DownloadData();
                        string urlFromUrlTextBox = AddProductUrlTextBox.Text;
                        var    rawHtml           = dl.FetchRawHtml(urlFromUrlTextBox);
                        if (rawHtml == string.Empty)
                        {
                            MessageBox.Show("Cannot connect to \"" + urlFromUrlTextBox + "\"");
                        }
                        else if (proshopUrlRegex.IsMatch(AddProductUrlTextBox.Text))
                        {
                            AssignTexboxesProshop(rawHtml);
                        }
                        else if (komplettUrlRegex.IsMatch(AddProductUrlTextBox.Text))
                        {
                            AssignTexboxesKomplett(rawHtml);
                        }
                    }
                    else
                    {
                        MessageBox.Show("Please provide a link to a supported website.");
                    }
                }
                else
                {
                    MessageBox.Show("Please provide a valid URL with \"http://\".");
                }
            }
            else
            {
                MessageBox.Show("Please enter a URL.");
            }
        }
        public async void FetchData()
        {
            Regex urlRegex         = new Regex(@"(https|http)://(www.)?.+?\.\w+");
            Regex proshopUrlRegex  = new Regex(@"(https|http)://(www.)?proshop\.dk");
            Regex komplettUrlRegex = new Regex(@"^(https|http)://(www.)?komplett\.dk");

            if (!string.IsNullOrEmpty(PUrlTxtBox.Text))
            {
                if (urlRegex.IsMatch(PUrlTxtBox.Text))
                {
                    testTextBox.Text = urlRegex.Match(PUrlTxtBox.Text).ToString();
                    if (proshopUrlRegex.IsMatch(PUrlTxtBox.Text) || komplettUrlRegex.IsMatch(PUrlTxtBox.Text))
                    {
                        var    dl = new DownloadData();
                        string urlFromUrlTextBox = PUrlTxtBox.Text;
                        var    downloadRawHtml   = Task <string> .Factory.StartNew(() => dl.FetchRawHtml(urlFromUrlTextBox));

                        TestLabel.Content      = "Waiting";
                        FetchDataBtn.IsEnabled = false;

                        await downloadRawHtml;
                        //TODO Evt. have mulighed for at cancel download med en knap oven på Fetch Data.
                        FetchDataBtn.IsEnabled = true;
                        var rawHtml = downloadRawHtml.Result;
                        TestLabel.Content = "Done";
                        if (rawHtml == string.Empty)
                        {
                            MessageBox.Show("Cannot connect to \"" + urlFromUrlTextBox + "\"");
                        }
                        else if (proshopUrlRegex.IsMatch(PUrlTxtBox.Text))
                        {
                            AssignTexboxesProshop(rawHtml);
                        }
                        else if (komplettUrlRegex.IsMatch(PUrlTxtBox.Text))
                        {
                            AssignTexboxesKomplett(rawHtml);
                        }
                    }
                    else
                    {
                        MessageBox.Show("Please provide a link to a supported website.");
                    }
                }
                else
                {
                    MessageBox.Show("Please provide a valid URL with \"http://\".");
                }
            }
            else
            {
                MessageBox.Show("Please enter a URL.");
            }
        }