ASPX.NET问题 本人小菜鸟 望内容说的你们能懂

        else if (Microsoft.VisualBasic.CompilerServices.Operators.CompareString(payType2, Conversions.ToString(36), false) == 0)
        {
            string str137 = Conversions.ToString(dataSet.Tables[0].Rows[0]["kbpay_ID"]);
            string str138 = Conversions.ToString(dataSet.Tables[0].Rows[0]["kbpay_Key"]);            if (Microsoft.VisualBasic.CompilerServices.Operators.CompareString(str137, "", false) == 0)
            {
                WEBSoft.MessgBox("请设置口碑平台商ID", "", 2);
            }
            if (Microsoft.VisualBasic.CompilerServices.Operators.ConditionalCompareObjectEqual(str138, "", false))
            {
                WEBSoft.MessgBox("请设置口碑的MD5密钥", "", 2);
            }            DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
            DateTime dtNow = DateTime.Parse(DateTime.Now.ToString());
            TimeSpan toNow = dtNow.Subtract(dtStart);
            string timeStamp = toNow.Ticks.ToString();
            timeStamp = timeStamp.Substring(0, timeStamp.Length - 7);            string str139 = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
            string str140 = timeStamp;
            string str141 = Conversions.ToString(Math.Round(PayMoney * 100, 0));
            string str143 = string.Concat(str2, "/Include/HnapayNotify.ashx");
            string str144 = string.Concat(str2, "/Include/HnapayReturn.ashx");
            string siteID1 = SiteID;
            string str146 = str1;
            string str147 = "wxqrcode";
            string str148 = lower;
            string str156 = str139;
            Pay pay = new Pay();
            string str159 = BaseModule.Md5(string.Concat(str138).ToLower(), "Sign", "UTF-8");
            string str154 = BaseModule.Md5(string.Concat(str148, str141, str147, str140, str137, str159).ToLower(), "Sign", "UTF-8");
            response.Write("<form name='Kino' id='Kino' method='get' action='http://api.chentianworld.com/waporder/order_add'>");
            response.Write(string.Concat("<input type='hidden' name='mch' value='", str137, "'>"));
            response.Write(string.Concat("<input type='hidden' name='key' value='", str138, "'>"));
            response.Write(string.Concat("<input type='hidden' name='pay_type' value='", str147, "'>"));
            response.Write(string.Concat("<input type='hidden' name='money' value='", str141, "'>"));
            response.Write(string.Concat("<input type='hidden' name='time' value='", str140, "'>"));
            response.Write(string.Concat("<input type='hidden' name='order_id' value='", str148, "'>"));
            response.Write(string.Concat("<input type='hidden' name='return_url' value='", str144, "'>"));
            response.Write(string.Concat("<input type='hidden' name='notify_url' value='", str143, "'>"));
            response.Write(string.Concat("<input type='hidden' name='sign' value='", str154, "'>"));
            response.Write("</form><script type='text/javascript'>document.Kino.submit();</script>");
            response.End();
        }
 这是一个支付接口  提交 POST数据得出来的数据是json类型 
{"net":true,"ok":true,"data":{"url":"http:\/\/api.tellni.cn\/qrcode\/a7789d2b5090c797dbc79f33c78a0864.png","img":"http:\/\/api.chentianworld.com\/qrcode\/eebe3ef10a110e39c9692135aafb143b.png"}}我想直接在上面所示代码 直接显示出POST得出来的结果并截取其中我需要用到的字段  例如 http:\/\/api.chentianworld.com\/qrcode\/eebe3ef10a110e39c9692135aafb143b.png  
  不知道需要怎么做！   百度了 一晚上 也测试了 一晚上 没有得到我需要的结果  ， 以上代码 我是根据之前的支付接口 进行修改的