Server Error in '/' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 20:             int CategoryId = Utils.GetDefautInteger(Page.Request.QueryString["News_id"], 1); 
Line 21:             if (CategoryId != -1)
Line 22:                 plh.Controls.Add(LoadControl("~/MasterPages/news_control.ascx", News.NewsGetById(CategoryId).NewParentId, 2));
Line 23:             else
Line 24:                 plh.Controls.Add(LoadControl("~/MasterPages/news_control.ascx", -1, 2));//xem tat thong bao

Source File: c:\Sites\thptdongmy.edu.vn\news_list.aspx.cs    Line: 22

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   news_list.Page_Load(Object sender, EventArgs e) in c:\Sites\thptdongmy.edu.vn\news_list.aspx.cs:22
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +91
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1031