急求答案！！！！！！！！

string lbms = ""; 
        string allprice = Request.QueryString["allprice"];      //总价钱 
        string payType = Request.QueryString["payType"];        //支付方式 
        goods = Request.QueryString["orderId"];                //商品ID 
        string sql = string.Format("select * from delivery where deliveryid =( select deliverymethord  from orders where goods='{0}')", goods); 
        DataSet ds = SqlDatabase.ExecuteDataset(DataProvider.ConnectionString, CommandType.Text, sql); 
        lbms = ds.Tables[0].Rows[0]["subject"].ToString();         string sqlOrder = string.Format("select * from orders where goods='{0}'", goods); 
        DataSet dsOrder = SqlDatabase.ExecuteDataset(DataProvider.ConnectionString, CommandType.Text, sqlOrder); 
        if (lbms != "") 
        {             if (lbms.Equals("支付宝支付")) 
            { 
              
                this.lbmsg.Text = "这是支付宝支付"; 
                #region 业务参数赋值 
                string gateway = "https://www.alipay.com/cooperate/gateway.do?"; //支付接口 
                string service = "create_partner_trade_by_buyer";                  //服务名称                 string seller_email = "[email protected]";                              //卖家帐号 
                string sign_type = "MD5";                                          //加密类型,签名方式“不用改” 
                string key = "hf2ychnf55aolq5cxkxxxfn2pexcws14";                    //安全校验码 
                string partner = "2088002960832666";                                //商户ID，合作ID 
                string _input_charset = "GBK";                                    //编码类型                 string show_url = "www.alipay.com";                                //展示地址                 string out_trade_no = goods;                                        //客户网站订单号，（现取系统时间，可改成网站自己的变量） 
                string subject = "进口";                                //商品名称 
                string body = "0";                                    //商品描述 
                string price = allprice;                              //商品价格 
                string quantity = dsOrder.Tables[0].Rows[0]["productnum"].ToString(); //商品数量                 string logistics_type = "POST";                                    //物流配送方式：POST(平邮)、EMS(EMS)、EXPRESS(其他快递) 
                string logistics_fee = ds.Tables[0].Rows[0]["fee"].ToString();      //物流配送费用 
                string logistics_payment = "BUYER_PAY";                            //物流配送费用付款方式：SELLER_PAY(卖家支付)、BUYER_PAY(买家支付)、BUYER_PAY_AFTER_RECEIVE(货到付款)                 //服务器通知url（Alipay_Notify.asp文件所在路经） 
                string notify_url = "http://localhost:1193/swnet05utf8/Alipay_Notify.aspx"; 
                //服务器返回url（return_Alipay_Notify.asp文件所在路经） 
                string return_url = "http://localhost:1193/swnet05utf8/Alipay_Return.aspx"; 
                //相关参数名称具体含义，可以在支付宝接口服务文档中查询到， 
                //以上两个文件，通知正常都可以在notify data目录找到通知过来的日志 
                string aliay_url = AliPay.CreatUrl( 
                    gateway, 
                    service, 
                    partner, 
                    sign_type, 
                    out_trade_no, 
                    subject, 
                    body, 
                    price, 
                    show_url, 
                    seller_email, 
                    key, 
                    return_url, 
                    _input_charset, 
                    notify_url, 
                    logistics_type, 
                    logistics_fee, 
                    logistics_payment, 
                    quantity 
                    ); 
如果我把“商品名称（subject）的值”改成 数字和字符串就不报错，但是一改成汉字就报错！！请教高手解答！！急！！！！！！