Entity Framework Basics

Entity Framework is a open source OR Mapper from Microsoft. It is installed via NuGet Package Manager to a Visual Studio Project.
There are 3 main ways to use it:
1.Database first: By Adding a new Entity Framework Model you can choose "from existing Database". A Wizard let you select the objects you want to generate Entity Model and Entity Classes for.
2.Model first: By Adding a new Entity Framework Model you can choose "Empty Model". then you can add Entities in the Model Designer - Entity c# Classes are generated when you build the Project, you can deploy it to a database by choosing "Update Database" from the Context Menu in the Model Designer.
3.Code first: You write c# classes and add them as DbSet to a Entity Context Class (derives from System.Data.Entity.DbContext). Then the DBContext creates a Database with Tables for every Class in a DbSet Property and for all related classes. It also creates Relations.