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In this section you'll use Entity Framework Code First Migrations to migrate some changes to the model classes so the change is applied to the database.
By default, when you use Entity Framework Code First to automatically create a database, as you did earlier in this tutorial, Code First adds a table to the database to help track whether the schema of the database is in sync with the model classes it was generated from.
You can run manual SQL to return the DB to the way Entity Framework expects (the way it was before you manually modified it, which brings it back in line with the hash) by inspecting what you had before and what your db currently looks like.
If that's not feasible you are now in the ugliest part of Entity Framework Code First.
Most importantly it shows what migrations have been applied.
At some point it may be necessary to manually remove records from here.
I have spent quite a bit of time mastering a process that works well for me.
Either manually delete/update the database, or call Database.
Set Initializer with an IDatabase Initializer instance.
If they aren't in sync, the Entity Framework throws an error.
This makes it easier to track down issues at development time that you might otherwise only find (by obscure errors) at run time.