>>>>>AFAIK, if the query is executed against an instance of System.Data.Linq.DataContext linq will use Linq to Sql ; if against System.Data.Objects.ObjectContext then it will use Linq to Entities....
>>>>
>>>>In our case it's an interface based on another interface class which is defined as
>>>>
>>>>

>>>> public interface IContext : IDisposable
>>>>    {
>>>>        IDbSet<T> Set<T>() where T : class;
>>>>        int SaveChanges();
>>>>        void SetModified(object entity);
>>>>        void SetAdd(object entity);
>>>>        void SetDeleted(object entity);
>>>>        void ExecuteSqlCommand(string sql);
>>>>        EntityState GetEntityState(object entity);
>>>>        bool IsLoaded(object entity, string navigationPropertyName);
>>>>        void Load(object entity, string navigationPropertyName);
>>>>        DbPropertyValues GetOriginalValues(object entity);
>>>>        DbPropertyValues GetCurrentValues(object entity);
>>>>        void EnsurePaddedPrimaryKey<T>(T entity) where T : class;
>>>>        ObjectContext CoreContext { get; }
>>>>    }

>>>>
>>>>And the code in the method is
>>>>
>>>>

>>>> var query = this._siriusContext.Max4Sale.Where(m4s => m4s.Type == max4sale.Type);

>>>>
>>>>_siriusContext is an instance of this
>>>>
>>>>

>>>> public interface ISiriusSqlContext : IContext
>>>>    {
>>>>        IDbSet<AccActv> AccActv { get; set; } // acc_actv
>>>>        IDbSet<Access> Access { get; set; } // access
>>>>       etc. for all other tables/views
>>>>  }
>>>>

>>>
>>>So what is the Type on _siriusContext ?
>>
>>

>>namespace SysManager.Repository
>>{
>>    public abstract class RepositoryBaseWithList<T, TList> : IRepositoryWithList<T, TList> 
>>    where T : class where TList: class
>>    {
>>        protected readonly ISiriusSqlContext _siriusContext;
>>
>>        protected readonly IDbSet<T> _dbSet;
>>        protected readonly IDbSet<TList> _dbSetList;
>>        private readonly IExceptionParser _exceptionParser;
>>etc.

>
>That tells me the Interface not the Type

I am not sure what else can I provide. The particular class where I am using it is

 public class Max4SaleRepository : RepositoryBaseWithList<Max4Sale, Max4SaleList>, IMax4SaleRepository
    {
        public Max4SaleRepository(ISiriusSqlContext context)
            : base(context)
        {
        }