asp.net 后台页面弹框

第一种：这种简单，但是会出现闪屏

Response.Write("<script language=javascript>alert(\"OK！\");</script>");

第二种：这种不会出现闪屏

        /// <summary>
        /// 弹框提示
        /// </summary>
        /// <param name="msg"></param>
        /// <param name="webPage"></param>
        public static void AlertMsg(string msg, Page webPage)
        {
            string strScript = "";
            strScript = ("<script language=javascript>");
            strScript += ("alert('" + msg + "');");
            strScript += ("</script>");
            webPage.ClientScript.RegisterStartupScript(webPage.GetType(), "MsgBox", strScript);
        }