public static void OpenUrl(Page page, string url)
        {
            string strFun = string.Empty;
            string msgFunId = Guid.NewGuid().ToString();
            strFun += "<script type=\"text/javascript\">window.open('" + url + "')</script>";

            ScriptManager.RegisterStartupScript(page, page.GetType(), msgFunId, strFun, false);
        }