AddObject in Entity Framework not working (MVC 4)

Question

I'm coding a web by MVC4. I use Entity Framework and Visual Studio Express 2012 for web. When I code Insert for Student, have a problem:

demoMVCEntities db = new demoMVCEntities();
n412_Student _newStudent = new n412_Student();
_newStudent.Student_FirstName = _fname;
_newStudent.Student_LastName = _lname;
_newStudent.Student_Phone = _phone;
_newStudent.Student_Email = _email;
_newStudent.Student_Province = _provinces;
db.n412_Student.AddObject(_newStudent);

AddObject is red underlined. Message Error:

"'System.Data.Entity.DBSet' does not contain a definition for 'AddObject' and no extension method 'AddObject' accepting a first argument of type...."

Please help me.. thanks..!

Answer 1

AddObject is a method of the ObjectContext but in newer versions of Entity Framework you are typically working against a DbContext .This new class uses DbSet<TEntity> instead of old ObjectSet<TEntity> . New set class has method Add . So, as the exception said, you are working with a DBSet object ( n412_Student ), that have an Add method. You need to do this:

db.n412_Student.Add(_newStudent);

If you want to see the difference between AddObject and Add methods, you can check this post