I have 4 projects :
Toombu.Entities : all models are there Toombu.DataAccess: Mapping, Repository and ToombuContext Toombu.Logique : Logic of my application
enable-migrations -EnableAutomaticMigration:$false with this command you can enable migration at Ef 6.3 version because C# enable as default migrations at Ef 6.3 version.