Three DIFFERENT approaches to implement ENTITY Framework are as follows:

• Code First Approach: The Code First approach primarily uses classes to create the model and its relations, which are then used to create a database. This way, developers can work in an object-oriented manner without considering the database structure. By following this model, developers first WRITE POCO classes and then use these classes to create the database. Code First is the method used by most developers using Domain-Driven Design (DDD).
• Model First Approach: In contrast, the Model First approach uses ORM to build model classes and their RELATIONSHIPS. Following the successful creation of the model classes and relationships, the physical database is created using these models.
• Database-First Approach: In Entity Framework, Database First approach is used to build entity models based on existing databases and reduce the amount of code required. By using this approach, domain and context classes can be created based on existing classes.