Как распоряжаться этими объектами?

Question

В проекте, который я поддерживаю, есть группа пользовательских элементов управления, в которых объекты SPWeb и SPSite инициализируются в конструкторе из SPContext. Эти объекты затем передаются другим классам.

public MyUserControl : UserControl
{  
private SPWeb web;
public MyUserControl() { web = SPContext.Current.Web; }
AnotherClass.SomeMethod ( web );
}

Журналы заполнены следующими двумя записями:

1)

Detected use of SPRequest for previously closed SPWeb object.  Please close SPWeb objects when you are done with all objects obtained from them, but not before.  Stack trace:   
 at Microsoft.SharePoint.SPListItemCollection.EnsureListItemsData()    
 at Microsoft.SharePoint.SPListItemCollection.GetEnumerator()    
 at XXXXXXXX.Web.UserControls.TopNavigation.LoadTopImage()    
 at XXXXXXXX.Web.UserControls.TopNavigation.OnLoad(EventArgs e)    
 at System.Web.UI.Control.LoadRecursive()    
 at System.Web.UI.Control.LoadRecursive()    
 at System.Web.UI.Control.LoadRecursive()    
 at System.Web.UI.Control.LoadRecursive()    
 at System.Web.UI.Control.LoadRecursive()    
 at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)    
 at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)    
 at System.Web.UI.Page.ProcessRequest()    
 at System.Web.UI.Page.ProcessRequest(HttpContext context)    
 at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()    
 at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)    
 at System.Web.HttpApplication.PipelineStepManager.ResumeSteps(Exception error)    
 at System.Web.HttpApplication.BeginProcessRequestNotification(HttpContext context, AsyncCallback cb)    
 at System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context)    
 at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags)    
 at System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags)    
 at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags)    
 at System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags)

2)

An SPRequest object was not disposed before the end of this thread.  To avoid wasting system resources, dispose of this object or its parent (such as an SPSite or SPWeb) as soon as you are done using it.  This object will now be disposed.  Allocation Id: {444DCCA1-C2F6-493D-9D02-D04F75C6E384}  This SPRequest was allocated
 at   
 at Microsoft.SharePoint.Library.SPRequest..ctor()    
 at Microsoft.SharePoint.SPGlobal.CreateSPRequestAndSetIdentity(SPSite site, String name, Boolean bNotGlobalAdminCode, String strUrl, Boolean bNotAddToContext, Byte[] UserToken, String userName, Boolean bIgnoreTokenTimeout, Boolean bAsAnonymous)    
 at Microsoft.SharePoint.SPWeb.InitializeSPRequest()    
 at Microsoft.SharePoint.SPWeb.InitWebPublic()    
 at Microsoft.SharePoint.SPWeb.get_LanguageCulture()    
 at Microsoft.SharePoint.SPWeb.get_Title()    
 at XXXXXXXXX.DataAccessUtility.<>c__DisplayClassc.<GetSitesTopNav>b__8()    
 at Microsoft.SharePoint.SPSecurity.<>c__DisplayClass4.<RunWithElevatedPrivileges>b__2()    
 at Microsoft.SharePoint.Utilities.SecurityContext.RunAsProcess(CodeToRunElevated secureCode)    
 at Microsoft.SharePoint.SPSecurity.RunWithElevatedPrivileges(WaitCallback secureCode, Object param)    
 at Microsoft.SharePoint.SPSecurity.RunWithElevatedPrivileges(CodeToRunElevated secureCode)    
 at XXXXXXXX.GetSitesTopNav(SPSite site, SPWeb Currentweb, String userName)    
 at XXXXXXXX.Web.UserControls.TopNavigation.PopulateSiteSelection()    
 at XXXXXXXX.Web.UserControls.TopNavigation.OnLoad(EventArgs e)    
 at System.Web.UI.Control.LoadRecursive()    
 at System.Web.UI.Control.LoadRecursive()    
 at System.Web.UI.Control.LoadRecursive()    
 at System.Web.UI.Control.LoadRecursive()    
 at System.Web.UI.Control.LoadRecursive()    
 at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)    
 at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)    
 at System.Web.UI.Page.ProcessRequest()    
 at System.Web.UI.Page.ProcessRequest(HttpContext context)    
 at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()    
 at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)    
 at System.Web.HttpApplication.PipelineStepManager.ResumeSteps(Exception error)    
 at System.Web.HttpApplication.BeginProcessRequestNotification(HttpContext context, AsyncCallback cb)    
 at System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context)    
 at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags)    
 at System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags)    
 at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags)    
 at System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags)

Правильно ли передавать URL-адрес, полученный из SPContext.Current.Web.Url? Есть предложения?