>>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 ?