Using [Foreignkey(")] - MVC

Question

This is my domain

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Web.Mvc;

namespace Dominio
{
    public class Bolsa_AlunoProva
    {
        public int ID { get; set; }
        public int Nota { get; set; }
        public DateTime DataInicial { get; set; }
        public DateTime DataFinal { get; set; }

        public virtual Bolsa_Aluno Aluno { get; set; }

        [ForeignKey("Bolsa_ProvaID")]
        public virtual Bolsa_Prova Prova { get; set; }

    }
}

However, I cannot use the [ForeignKey("Bolsa_ProvaID")] because it points to lack of references. However, the necessary reference is not only System.ComponentModel.DataAnnotations ?

@Edit

Answer 1

This annotation only exists for . NET Framework 4.5 onwards. Consider switching your application to Framework 4.5.

I teach that in this answer.

More: http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.schema(v=vs.113). aspx

Answer 2

The correct using is the: System.ComponentModel.DataAnnotations.Schema;