/*System.NullReferenceException: 未将对象引用设置到对象的实例。
   at Superdata.SDNet.WebCAD.Web.SiteResolve.Pages.V3x.JsHandlerPage.BuyCar(HttpContext context)
   at Superdata.SDNet.WebCAD.Web.SiteResolve.Pages.V3x.JsHandlerPage.PrepareData()*/