LinQ: How to enable ExecuteQuery

I would like to use ExecuteQuery to run a direct query but for some reason it is not an option in the intellisense menu for my BusinessData context.  Is there a namespace that I'm missing or could it be the way the BusinessData context is configured?  Also, I'm not sure if it makes a difference but I am using Code First Entityframework with an Oracle database.


uiValue = BusinessData.ExecuteQuery<string>(tsql).First();


Namespaces included in my class:

using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Reflection;
using System.Data.Objects.SqlClient;
using System.Data;
using System.Data.Objects;
using System.Linq.Dynamic;
using System.Data.Linq.SqlClient;
using System.Linq;
using System.Web;
using System.Configuration;
using System.Net;
using Newtonsoft.Json;
using System.Web.SessionState;
using System.Text;
using System.Collections.Specialized;
using System.IO;
using System.Data.Entity;
using System.Transactions;


Thanks