Entity Framework in Visual studio 2008

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.Objects;
using System.Data.SqlClient;
using System.Data.EntityClient;

public static DataTable ExecuteStoredProcedure(ObjectContext db, string storedProcedureName, List<SqlParameter> parameters)
     {
         var connectionString = ((EntityConnection)db.Connection).StoreConnection.ConnectionString;
         using (var data = new DataTable())
         {
             using (var conn = new SqlConnection(connectionString))
             {
                 using (var cmd = conn.CreateCommand())
                 {
                     cmd.CommandText = storedProcedureName;
                     cmd.CommandType = CommandType.StoredProcedure;
                     cmd.Parameters.AddRange(parameters.ToArray());
 
                     using (var adapter = new SqlDataAdapter(cmd))
                     {
                         adapter.Fill(data);
                     }
                 }
             }
 
             return data;
         }
     }