“/”应用程序中的服务器错误。

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行 3265:            finally
行 3266:            {
行 3267:                dr.Close();
行 3268:            }
行 3269:            return str;

[NullReferenceException: 未将对象引用设置到对象的实例。]
   jss_fc.JSSMethods.mt_toponecolumnname(String tagename, OperateDB con, String id, String[] param) in d:\website\lajs_netweb\App_Code\jss_fc\JSSMethods.cs:3267
   jss_fc.JSSMethods.TAGES_SINGLE(String tagename, OperateDB con, String[] param, String[] idsparam) in d:\website\lajs_netweb\App_Code\jss_fc\JSSMethods.cs:67
   prolist.Page_Load(Object sender, EventArgs e) in d:\website\lajs_netweb\prolist.aspx.cs:61
   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