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Keep in mind you'll need to run IIS reset for the permissions changes to take effect. You will need to detach the database for permissions to take effect by running the SQL Server Express Utility
If you are still receiving errors, it could be for these reasons:
- In your connection string, is the user name and password for the Network Service account? If you are using another user, is that user part of the db_Owner role?
- Are there other read-only files in the App_Data folder?
- Is simple file sharing enabled in your application? If so, you will need to turn it off. Go to Folder Options>View>Use Simple File Sharing (Recommended)" to view security tab in file or folder properties.
For more information on this issue, please read this forum post:
I hope that these suggestions help solve your issue. If you need additional assistance, please do not hesitate to contact us.