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I recently got the following error message whilst trying to write to an excel file using the openXML library in ASP.Net and C#:
System.ApplicationException: Access is denied. (Exception from HRESULT: 0×80070005 (E_ACCESSDENIED))
at System.IO.IsolatedStorage.IsolatedStorageFile.nGetRootDir(IsolatedStorageScope scope)
at System.IO.IsolatedStorage.IsolatedStorageFile.InitGlobalsNonRoamingUser(IsolatedStorageScope scope)
at System.IO.IsolatedStorage.IsolatedStorageFile.GetRootDir(IsolatedStorageScope scope)
at System.IO.IsolatedStorage.IsolatedStorageFile.GetGlobalFileIOPerm(IsolatedStorageScope scope)
at System.IO.IsolatedStorage.IsolatedStorageFile.Init(IsolatedStorageScope scope)
at System.IO.IsolatedStorage.IsolatedStorageFile.GetStore(IsolatedStorageScope scope, Type domainEvidenceType, Type assemblyEvidenceType)
at MS.Internal.IO.Packaging.PackagingUtilities.ReliableIsolatedStorageFileFolder..ctor()
at MS.Internal.IO.Packaging.PackagingUtilities.GetDefaultIsolatedStorageFile()
at MS.Internal.IO.Packaging.PackagingUtilities.CreateUserScopedIsolatedStorageFileStreamWithRandomName(Int32 retryCount, String& fileName)
at MS.Internal.IO.Packaging.SparseMemoryStream.EnsureIsolatedStoreStream()
at MS.Internal.IO.Packaging.SparseMemoryStream.SwitchModeIfNecessary()
at [...]

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Page Refresh Animations

This refers to the way in which we can display some form of feedback to the user that the page is being updated, without the need for an ugly page flash or the page seemingly doing nothing.
 As always there are several ways to achieve this – a quick google will probably reveal several. [...]

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The ViewState in ASP.Net is one of those weird and wonderful things that Microsoft obviously thought was a good idea at the time. Granted, it is quite useful but as with all things like that, it comes with a price – and a fairly hefty one at that if not used sensibly.

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Ok, so i’ve just been working on outputting data from an ASP.NET based web app into an Excel Spreadsheet. I’m not going to go into the details of how to do that, but only how to avoid one little problem i encountered.

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