的Cookie在應用程序在Global.asax警告添加日誌

在我的Global.asax文件中，我有以下：的Cookie在應用程序在Global.asax警告添加日誌

void Session_End(object sender, EventArgs e) 
{ 
    System.Web.HttpCookie isAccess = new System.Web.HttpCookie("IsAccess"); 
    isAccess.Expires = DateTime.Now.AddDays(-1); 
    isAccess.Value = ""; 
    System.Web.HttpContext.Current.Response.Cookies.Add(isAccess); 
}

所以每到這個方法這就是所謂的應用程序時，將記錄在以下事件應用程序日誌作爲警告：

Event code: 3005 
Event message: An unhandled exception has occurred. 
Event time: 5/25/2010 12:23:20 PM 
Event time (UTC): 5/25/2010 4:23:20 PM 
Event ID: c515e27a28474eab8d99720c3f5a8e90 
Event sequence: 4148 
Event occurrence: 332 
Event detail code: 0 

Application information: 
    Application domain: /LM/W3SVC/2100509645/Root-1-129192259222289896 
    Trust level: Full 
    Application Virtual Path:/
    Application Path: <PathRemoved>\www\ 
    Machine name: TIPPER 

Process information: 
    Process ID: 6936 
    Process name: w3wp.exe 
    Account name: NT AUTHORITY\NETWORK SERVICE 

Exception information: 
    Exception type: NullReferenceException 
    Exception message: Object reference not set to an instance of an object. 

Request information: 
    Request URL: 
    Request path: 
    User host address: 
    User: 
    Is authenticated: False 
    Authentication Type: 
    Thread account name: NT AUTHORITY\NETWORK SERVICE 

Thread information: 
    Thread ID: 7 
    Thread account name: NT AUTHORITY\NETWORK SERVICE 
    Is impersonating: False 
    Stack trace: at ASP.global_asax.Session_End(Object sender, EventArgs e) in <PathRemoved>\Global.asax:line 113

任何想法爲什麼此代碼會導致此錯誤？

來源

2010-05-25 Random Developer

您打電話的方法是？ – 2010-05-25 16:37:36

對不起，我忘了添加這個，它在Session_End。 – 2010-05-25 17:08:54

爲了簡單起見，網站A包含了另一個小型網站B.B是舊的代碼，最終將併入網站A.在我們這樣做之前，我們希望網站A控制進入網站B.因爲它們是不同的我們使用cookie的體系結構，但最終我們想要終止cookie。那麼在會議結束之前你怎麼稱呼它被破壞？ – 2010-05-25 17:15:43