使用VS2012创建了一个控制台程序，添加ADO.NET Entity Data Model，但是提示CreateQuery<Contact>方法不存在!
代码如下：

private static void QueryContactsUseEntitySQL()

        {

            using (var context = new SampleEntities())

            {

                var queryString =   "SELECT VALUE c " +

                                    "FROM SampleEntities.Contacts AS c " +

                                    "WHERE c.FirstName='Robert'";

                ObjectQuery<Contact> contacts = context.CreateQuery<Contact>(queryString);

                foreach (var contact in contacts)

                {

                    Console.WriteLine("{0} {1}", contact.FirstName.Trim(), contact.LastName);

                }

            }

            Console.Write("Press Enter...");

            Console.ReadLine();

        }

创建的类如下：

namespace Chapter2ConsoleApp

{

    using System;

    using System.Data.Entity;

    using System.Data.Entity.Infrastructure;

    

    public partial class SampleEntities : DbContext

    {

        public SampleEntities()

            : base("name=SampleEntities")

        {

        }

    

        protected override void OnModelCreating(DbModelBuilder modelBuilder)

        {

            throw new UnintentionalCodeFirstException();

        }

    

        public DbSet<Address> Addresses { get; set; }

        public DbSet<Contact> Contacts { get; set; }

        public DbSet<vOfficeAddresses> vOfficeAddresses { get; set; }

    }

}

已经引用了using System.Data.Objects;命名空间，请问如何解决，谢谢！
------解决方案--------------------
ObjectQuery本来就没有这个方法，只有CreateContext才有CreateQuery。