I started a project using Entity Framework 4.3 Code First with manual migrations and SQL Express 2008 and recently updated to EF5 (in VS 2010) and noticed that now when I ch
This is a fine answer, however, if you're just looking for a 'quick fix' approach, there's this as well EF Migrations DropForeignKey fails when key is in a base class
Use the DropForeignKey overload which contains the parameters principalName and name -- which in this case means constraint name!