[NullReferenceException: 未将对象引用设置到对象的实例。]
   contents.BindData() in g:\#WEB-xi\WEB-qcx\content.aspx.cs:52
   contents.Page_Load(Object sender, EventArgs e) in g:\#WEB-xi\WEB-qcx\content.aspx.cs:20
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +24
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +136
   System.Web.UI.Control.LoadRecursive() +97
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2523