public class Student
{
    [Key]
    public int ID {get;set;}
    public string Name {get;set;}
    public virtual ICollection<Class> Classes {get;set;}
}

public class Class
{
[Key]
public int ID {get;set;}
public Student Student {get;set;}
public DateTime EnrollmentDate {get;set;}
public string Name {get;set;} // this comes from the Courses data table
}