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http://www.codecouch.com/2012/05/adding-document-queryselectorall-support-to-ie-7/

delete local db, mvc code first

Entity Framework Code First: Delete a LocalDb instance

by adamstephensen

When working with the Entity Framework Code First I will often get the error below:

An exception of type “System.Data.SqlClient.SqlException’ occurred in EntityFramework.dll but was not handled by in user code’

Additional information: Cannot drop database [database name] because it is currently in use.

To force a delete of the database, follow the steps below.

Figure: This exception is common after you have opened a LocalDb database in Visual Studio.

Open Library Package Manager and Stop the LocalDb instance

a: Select Tools | Library Package manager | Package Manager Console

b: Execute the following two statements

                  sqllocaldb stop v11.0

                  sqllocaldb delete v11.0

Figure: The steps above will stop and delete the LocalDb instance.

Delete the database file from the database

Figure: Open the Solution Explorer and choose Show All Files

Figure: Delete the mdf from the App_Data folder