二维码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;

namespace JTZK_Handle
{
    public class HandleEr
    {
        public static string GetEr()
        {
            string html = @"<div style=""text-align: center;border: solid 1px #cacaca; margin-top:20px"">

                <p style=""border-bottom: solid 1px #cacaca; line-height: 40px;"">
                    <img align=""middle"" src=""/images/weixinico.png"" />&nbsp;微信扫一扫，分享到朋友圈
                 </p>
                 <p style=""margin-bottom: 20px; margin-top: 20px;"">
                    <img src=""http://s.jiathis.com/qrcode.php?url={0}"" width=""140"" height=""130"" />
                 </p> 
             </div>";
            return string.Format(html, HttpContext.Current.Request.Url.ToString());
        }
    }
}

<%=JTZK_Handle.HandleEr.GetEr() %>