求助 '=' 附近有语法错误

购物车中去付款的代码：
protected void Button1_Click(object sender, EventArgs e)
        {

            Maticsoft.BLL.ShoppingCart cart = Session["ShoppingCart"] as Maticsoft.BLL.ShoppingCart;
            if (cart != null)
            {
                Maticsoft.Model.Users user = Session["user"] as Maticsoft.Model.Users;
                Maticsoft.BLL.Order orders = new Maticsoft.BLL.Order();
                if (user != null)
                {
                    string strWhere = string.Format("Uid={0}", user.id);
                    Maticsoft.BLL.Site siteBll = new Maticsoft.BLL.Site();

                    List<Maticsoft.Model.Site> userSiteList = siteBll.GetModelList(strWhere);

                    if (RadioButtonList1.SelectedIndex > -1)
                    {
                        int i = RadioButtonList1.SelectedIndex;
                        string nameStr = userSiteList[i].ReceiverName;
                        string phoneStr = userSiteList[i].Phone;
                        string addressStr = userSiteList[i].Address;
                        int j = DropDownList1.SelectedIndex;
                        int fight;
                        string express;
                        if (j == 0)
                        {
                            fight = 5;
                            express = "快递";
                        }
                        else if (j == 1)
                        {
                            fight = 10;
                            express = "平邮";
                        }
                        else
                        {
                            fight = 15;
                            express = "EMS";
                        }

                        // Label1.Text = "You selected: " + RadioButtonList1.SelectedItem.Text + "INDEX:" + RadioButtonList1.SelectedIndex+"****"+fight+"****"+express;
                        //Maticsoft.BLL.ShoppingCart cart = Session["ShoppingCart"] as Maticsoft.BLL.ShoppingCart;
                        Maticsoft.Model.Order order = new Model.Order();
                        decimal money1 = order.Total + fight;
                        if (money1 > user.Ubalance)
                        {
                            (this, "请先充值", "UserCenter.aspx");
                            return;
                        }
                        BLL.Order oder = new BLL.Order();
                       
                        bool bool1 = oder.CheckOut(user.id,order.Total,cart,nameStr,phoneStr,addressStr,fight,express);
                        //bool bool1 =  oder.CheckOut(user.id, cart.Total, cart, nameStr, phoneStr, addressStr, fight, express);
                        if (bool1 == true)
                        {
                            // Label1.Text = "购物成功";
                            (this, "购物成功");
                        }

                    }
                }
            }
                    else
                    {
                        (this, "请先加载购物车");
                    }
                }