“/”应用程序中的服务器错误 。

    未将对象引用设置到对象的实例 。

    说明: 执行当前 Web 请求期间 ，出现未经处理的异常 。请检查堆栈跟踪信息 ，以了解有关该错误以及代码中导致错误的出处的详细信息 。

    异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例 。

    源错误: 

    
行 25:         <uc1:Header ID="HeadBar" runat="server" />
行 26:         <div class="banner1"></div>
行 27:         <div class="nav_line main">位置
： <a href="/">首页</a> > <a href="/news/class<%=this.dataSource.CategoryId %>.aspx"><%=this.dataSource.SelectedNewsCategory.CategoryName%></a> </div>
行 28:         <div class="main cont">
行 29: 	        <div class="con_left">

    源文件: f:\usr\localuser\syw4209090001\News.aspx    行: 27

    堆栈跟踪: 

    
[NullReferenceException: 未将对象引用设置到对象的实例
。]
   ASP.news_aspx.__Renderform1(HtmlTextWriter __w, Control parameterContainer) in f:\usr\localuser\syw4209090001\News.aspx:27
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +268
   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +216
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +32
   System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +53
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +57
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +40
   ASP.news_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in f:\usr\localuser\syw4209090001\News.aspx:14
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +268
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8
   System.Web.UI.Page.Render(HtmlTextWriter writer) +29
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +57
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1386

    版本信息: Microsoft .NET Framework 版本:4.0.30319; ASP.NET 版本:4.0.30319.34280