public static string GetAbsolutePathByRelative(string relative)
        {
            string applicatiionUrl = string.Concat(HttpContext.Current.Request.Url.Authority, 
                HttpContext.Current.Request.ApplicationPath);
            if (!applicatiionUrl.EndsWith("/"))
            {
                applicatiionUrl = string.Format("{0}/", applicatiionUrl); 
            }
            if (relative.StartsWith("../"))
            {
                relative = relative.Replace("../", "");
            }
            return string.Format("{0}://{1}{2}", HttpContext.Current.Request.Url.Scheme, applicatiionUrl, relative);
        }