删除的代码行出错,这是怎么回事?

Line 32:            ////authorization.Rules.Set(0, accessRule);
Line 33:            ////configuration.Save(ConfigurationSaveMode.Minimal); 
Line 34:            "**This is the red marked erroneous line**"
Line 35:  
Line 36:            //StackTrace stackTrace = new StackTrace();

这是什么黑魔法?行中没有代码,甚至没有调用该行,但我得到的错误报告为:

当前web请求。请查看堆栈跟踪以了解更多信息 有关错误的信息及其在代码中的来源。

授权规则必须指定用户和/或角色的列表。

源文件:C:\MyProject\Accounts。aspx。cs线:34

然而,所有涉及授权的代码都被注释掉了,甚至没有调用该方法。方法:

public static void WriteAccsToAuth(List<User> allAllowedUsers)
{
    //Configuration configuration = WebConfigurationManager.OpenWebConfiguration("~");
    //AuthorizationSection authorization = (AuthorizationSection)configuration.GetSection("system.web/authorization");
    //AuthorizationRule accessRule = new AuthorizationRule(AuthorizationRuleAction.Allow);
    ////foreach (User usr in allAllowedUsers)
    ////{
    ////    accessRule.Users.Add(usr.Domain + "\\" + usr.UserName);
    ////}
    ////Debug.WriteLine("Users count: " + accessRule.Users.Count);
    ////Debug.WriteLine("Rules count: " + authorization.Rules.Count);
    ////authorization.Rules.Set(0, accessRule);
    ////configuration.Save(ConfigurationSaveMode.Minimal);
    "**This is the red marked erroneous line**"

    //StackTrace stackTrace = new StackTrace();
    //Debug.WriteLine("Users written to config file. Called by method " + stackTrace.GetFrame(1).GetMethod().Name + ".");
}

public static void LoadUsers()
{
    ...
    //Accounts.WriteAccsToAuth(dbUsers.ToList());
    ...
}

我尝试过重建、重新启动Visual Studio和重新启动IIS。我的IIS是如何缓存错误的?我的意思是评论的行在错误消息中可见。。。我不知道这里发生了什么。