Associations in EF Code First: Part 5 – One-to-One Foreign Key Associations This is the fourth post in a series that explains entity association mappings with EF Code First. I've described these association types so far: Part 1 – Introduction and Basic Concepts Part 2 – Complex Types Part 3 – Shared Primary Key Associations Part 4 – Table Splitting Part 5 – One-to-One Foreign Key Associations Part