ATTACH DATABASE encountered operating system error 5 Access is denied Error

Issue:
While trying to attach an .MDF SQL Server Express Database to my current SQL Server Instance, I encountered with the below error. This was the error message received.

Attach database failed for Server 'HABEEB-HP\SQLEXPRESS'.  (Microsoft.SqlServer.Smo)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=11.0.2100.60+((SQL11_RTM).120210-1917+)&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Attach+database+Server&LinkId=20476
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ADDITIONAL INFORMATION:
An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)
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Unable to open the physical file "C:\testApp\App_Data\MyDB.mdf". Operating system error 5: "5(Access is denied.)". (Microsoft SQL Server, Error: 5120)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&ProdVer=10.00.5500&EvtSrc=MSSQLServer&EvtID=5120&LinkId=20476
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Solution:
Googling quiet a bit mis led me to some version conflict reasons and file system security access issues. I tried to give full access to Network Service to the file. I tried to run SQL Server Service with Administrator Privilege from some suggestions online and nothing worked. Fiddling on it after a break I could figure out that its an SQL Server Management Studio (SSMS) privilege issue. I opened SSMS as Administrator and everything worked as a breeze.