Code
private string ConvertHtml2Image()
        {
            string htmlStringToConvert = fcktext.Value;
            string baseURL = ConfigurationManager.AppSettings["BaseURL"];
            HtmlToImageElement htmlToImageElement = new HtmlToImageElement(0.0f, 0.0f, -1.0f, -1.0f, htmlStringToConvert, baseURL);
            string Imagepah = string.Empty;
            Imagepah = Path.Combine(Server.MapPath("~"), "Images/Version/" + Request.QueryString["templateID"] + "/");
            if (!Directory.Exists(Imagepah))
            {
                Directory.CreateDirectory(Imagepah);
            }
            string ImageName = Guid.NewGuid().ToString() + ".jpg";
            System.Drawing.Image img = htmlToImageElement.GetImage();
            img.Save(Imagepah + ImageName);
            return ImageName;
        }