[NullReferenceException: 未将对象引用设置到对象的实例。]
ASP.books_details_aspx.__Render__control2(HtmlTextWriter __w, Control parameterContainer) +14
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +114
System.Web.UI.HtmlControls.HtmlTitle.Render(HtmlTextWriter writer) +110
ASP.books_details_aspx.__RenderHead1(HtmlTextWriter __w, Control parameterContainer) +58
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +114
System.Web.UI.HtmlControls.HtmlHead.RenderChildren(HtmlTextWriter writer) +22
System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +41
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +239
System.Web.UI.Page.Render(HtmlTextWriter writer) +37
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4239
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