It is time to add some data to our table in the created database. We will insert a row, which is sometimes called a record. A record in the People table consists of values in three columns: PersonId, FirstName, and LastName. These values are going to be based on property values of an instance of the Person class, which is mapped to the People table. This is an important concept to remember. When we create entity classes, their purpose is to map to tables. There are some exceptions to this rule, which we will see in later chapters. This table is represented by a collection-based property in our Context class.

This property's type is DbSet of Person and its name is People. Conceptually, you can think of adding objects to that collection to be equivalent to inserting rows into the database's corresponding table. You need to use the Add method of DbSet to implement the addition of new data. The DbContext class has the SaveChanges method, which is responsible...