[NullReferenceException: 未将对象引用设置到对象的实例。]
PageVisit.buybook() in d:\m.bookdao.com\PageVisit.ashx:107
[TargetInvocationException: 调用的目标发生了异常。]
System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) +0
System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) +269
System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +146
System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters) +34
PageVisit.ProcessRequest(HttpContext context) in d:\m.bookdao.com\PageVisit.ashx:37
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +542
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +75
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +93
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