The underlying provider failed to open - Entity Framework Error

I found this error - "The underlying provider failed to open" while I was working on Entity framework project.

I searched this and found the solution.
Inner Exception says: Cannot open database "xxxx" requested by the login. The login failed.
Login failed for user 'xxxxx'.

Go to web.config and make changes in entity framework connection string
replace integrated security=True with User ID=xx;Password=xxxxx

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