Need Help with SqlDataReader

using System;
using System.Data.SqlClient;
using System.Data;
using TypeMock;
using NUnit.Framework;

namespace People
{
    public class Person
    {
        private int _Id = -1;
        public string Name = string.Empty;

        private Person(int Id) { DataFetch(Id); }
        
        public static Person GetPerson(int Id) { return new Person(Id); }

        private void DataFetch(int Id)
        {
            using (SqlConnection Cn = new SqlConnection("ConnectionString"))
            {
                Cn.Open();
               using (SqlCommand Cm = Cn.CreateCommand())
                {
                    Cm.CommandType = CommandType.StoredProcedure;
                    Cm.CommandText = "getPerson";
                    Cm.Parameters.AddWithValue("@Id", Id);
                    using (SqlDataReader dr = Cm.ExecuteReader())
                    {
                        _Id = Id;
                        Name = dr.GetString(1);
                    }
                }
            }
        }
    }

    [TestFixture]
    public class PersonTestFixture
    {
        [Test]
        public void TestGettingAPerson()
        {
            const int PERSON_ID = 1;
            const string PERSON_NAME = "John Smith";

            Mock MockSqlConnection = MockManager.MockAll(typeof(SqlConnection));
            Mock MockSqlCommand = MockManager.MockAll(typeof(SqlCommand));
            Mock MockSqlParameters = MockManager.MockAll(typeof(SqlParameterCollection), Constructor.NotMocked);
            Mock MockSqlDataReader = MockManager.MockAll(typeof(SqlDataReader), Constructor.Mocked);

            SqlDataReader dr = (SqlDataReader)MockManager.MockObject(typeof(SqlDataReader), Constructor.Mocked, null, null).Object;

            MockSqlConnection.ExpectCall("Open", 1);
            MockSqlConnection.ExpectCall("Close", 1);
            MockSqlParameters.ExpectUnmockedCall("AddWithValue", 1).Args("@Id", PERSON_ID);
            MockSqlCommand.ExpectAndReturn("ExecuteReader", dr, 1);
            MockSqlDataReader.ExpectAndReturn("GetString", PERSON_NAME, 1).Args(1);

            Person JohnSmith = Person.GetPerson(PERSON_ID);
            Assert.AreEqual(PERSON_NAME, JohnSmith.Name);
        }
    }
}