Access denied error when my Azure Website is shutting down (removing cache items)

[JHaleZir]

My app is working well on Azure Websites (not Web role, please exclude web role specific answers !), but sometimes I got the following error in my logs : \[code\]System.UnauthorizedAccessException: Access to the path 'C:\DWASFiles\Sites\myAzureWebSiteNameHere\VirtualDirectory0\site\wwwroot' is denied. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.FileSystemEnumerableIterator`1.CommonInit() at System.IO.FileSystemEnumerableIterator`1..ctor(String path, String originalUserPath, String searchPattern, SearchOption searchOption, SearchResultHandler`1 resultHandler, Boolean checkHost) at System.IO.Directory.EnumerateFiles(String path) at System.Web.WebPages.Deployment.WebPagesDeployment.AppRootContainsWebPagesFile(String path) at System.Web.WebPages.Deployment.PreApplicationStartCode.OnChanged(String key, Object value, CacheItemRemovedReason reason) at System.Web.Caching.CacheEntry.CallCacheItemRemovedCallback(CacheItemRemovedCallback callback, CacheItemRemovedReason reason)\[/code\]This happened just before the site is restarted (by Azure, not by me, probably for a maintenance operation on the VM containing the site). So I concluded that it happened during a "shutting down" operation, when the system try to clear the cache.I'm using the Asp.net cache like this : \[code\]HttpContext.Current.Cache[myKey] = something\[/code\] and I have not define any specific callback like \[code\]CacheItemRemovedCallback\[/code\]. The above callstack confirms the error is on a system callback.It seems to be Azure specific (and perhaps even specific to Azure Websites), because the same website on an on-premise server never had this kind of error. Do you know how to prevent this error from happening ? Thanks !