[NullReferenceException: 未将对象引用设置到对象的实例。]
book_groupDetail.BindBookDetail() in g:\book 20150409\book\detail\groupDetail.aspx.cs:570
book_groupDetail.Page_Load(Object sender, EventArgs e) in g:\book 20150409\book\detail\groupDetail.aspx.cs:86
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
System.Web.UI.Control.OnLoad(EventArgs e) +97
System.Web.UI.Control.LoadRecursive() +61
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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