我的头都快炸了！asp.net1.1+paypal标准版，notify_url取值的问题

 StreamReader stIn = new StreamReader(req.GetResponse().GetResponseStream());
        strResponse = stIn.ReadToEnd();
        stIn.Close();        if (strResponse.Substring(0, 7) == "SUCCESS")
        {            String[] StringArray = strResponse.Split();            int i;
            for (i = 1; i < StringArray.Length - 1; i++)
            {
                String[] StringArray1 = StringArray[i].Split('=');                sKey = StringArray1[0];
                sValue = StringArray1[1];                switch (sKey)
                {
                    case "first_name":
                        fname = sValue;
                        break;                    case "last_name":
                        lname = sValue;
                        break;                    case "mc_gross":
                        mc_gross = sValue;
                        break;                    case "item_name":
                        itemName = sValue;
                        strOrderDesp = sValue;
                        break;                    case "item_number":
                        item_number = sValue;
                        strOrderNo = sValue;
                        break;                    case "mc_currency":
                        Pmtcurrency = sValue;
                        strOrderAmount = sValue;
                        break;                    case "payer_email":
                        strPaypalAccount = sValue;
                        break;                    case "payer_status":
                        strPayerStatus=sValue;
                        break;                    case "payment_gross":
                        strOrderAmount = sValue;
                        break;
                }
            }            string orderType = item_number.Substring(0, 2);            if (orderType == "GB")
            {
                DealSellOrder();
            }
            if (orderType == "PL")
            {
                DealPowerOrder();
            }
        }        else if (strResponse.Substring(0, 4) == "FAIL")
        {
            lbResult.Text = "You  payment fail! ";
        }        else
        {
            lbResult.Text = "You  payment fail! ";
        }    }