However, there are some special cases where you should not dispose the object programmatically. The following code example shows one case where you would not want the runtime to construct a finally block and dispose objects for you
using( SPWeb web = SPControl.GetContextWeb(HttpContext.Current)) { ... }
This is because SPContext objects are managed by the SharePoint framework and should not be explicitly disposed in your code. This is true also for the SPSite and SPWeb objects returned by SPContext.Site, SPContext.Current.Site, SPContext.Web, and SPContext.Current.Web.
You receive the “Trying to use an SPWeb object that has been closed or disposed and is no longer valid” when page is in edit mode if you tried to dispose SPContext retrieved objects.
http://msdn.microsoft.com/en-us/library/aa973248.aspx
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