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Editorial Team
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Asked: 2026-05-26T07:35:12+00:00

I’m having trouble deploying an ASP.Net application using Sql Server CE 4.0. I get

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I’m having trouble deploying an ASP.Net application using Sql Server CE 4.0. I get the following error:

Access to the database file is not allowed.

I’ve verified that I’m using the local “add_data” folder in my connection string: 

<add name="DemoStudy" connectionString="metadata=res://*/Data.StudyContext.csdl|res://*/Data.StudyContext.ssdl|res://*/Data.StudyContext.msl;provider=System.Data.SqlServerCe.4.0;provider connection string=&quot;Data Source=|DataDirectory|\CRS20SandboxCE.sdf&quot;" providerName="System.Data.EntityClient"/>

I’ve also tried granting IUSR account full access to the app_data directory, but that didn’t seem to help. Another SO thread suggests granting IUSR access to the bin directory, but that didn’t help either.

UPDATE:
Well, it’s definitely a permissions issue. If I give the “Everyone” user group access to the app_data folder, everything works fine.

QUESTION:
What is the correct user to give full access to in IIS 7? It’s obviously not IUSR…

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1 Answer

  1. Editorial Team

    One must grant read/write access to the appropriate app_pool user. In this case, 

    IIS APPPOOL\DefaultAppPool

    Note that the user group must be specified as shown.

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