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Home/ Questions/Q 8500391
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Editorial Team
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Editorial Team
Asked: June 11, 20262026-06-11T00:55:57+00:00 2026-06-11T00:55:57+00:00

I create the Entity DB (if file not exists) in C:\Temp\MyDB.mdf using : MyEFContext.CreateDatabase()

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I create the Entity DB (if file not exists) in C:\Temp\MyDB.mdf using : MyEFContext.CreateDatabase().

I can open the DB with VS Express 2010 and navigate through it but when attempting to adding (Joining) the DB in SSMS i get the following error : Unable to open the physical file "C:\Temp\MyDB.mdf". Operating system error 5: "5(Access is denied.)". (Microsoft SQL Server, Error: 5120)

How can I fix this?
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  1. Editorial Team
    Editorial Team
    2026-06-11T00:55:59+00:00Added an answer on June 11, 2026 at 12:55 am

    This is a rights issue.

    In the case where it works you are in the user context of the user account that you logged in with.

    In the case where it does not work, it is the user account that the SQL server is running under that is trying to access the file.

    Check which account SQL server is using, then give that account access to the files on the temp directory.

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