Code First Problems and Fixes

Problem

After you delete a database and come across this problem

"Cannot attach the file  ERROR"  -    after Deleting MDF (database) file

Fix

1. Remove old database connection string out of Web.Config
2. Open the "Developer Command Propmpt for VisualStudio" under your start/programs menu.
3. Run the following commands:
   sqllocaldb.exe stop v11.0
sqllocaldb.exe delete v11.0