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    private void verifybutton_Click(object sender, EventArgs e)
            {
                string firsttext = manganamebox.Text.ToLower();
                string originalname = firsttext;
                string manganame = firsttext.Replace(" ", "-");
                Regex rgx = new Regex("[^a-zA-Z0-9 -]");
                manganame = rgx.Replace(manganame, "");
                string url = "http://s2.mangareader.net/cover/" + manganame + "/" + manganame + "-l0.jpg";
                // Download web image (cover)
                Image _Image = null;
                _Image = DownloadImage(url);
                // check for valid image
                if (_Image != null)
                {
                    // show image in picturebox
                    pictureBox1.Image = _Image;
                    filename.Text = firsttext+".pdf";
                    string filenme = firsttext.Replace(" ", "-");
                    filename.Text = filenme+".pdf";
                }
            }