public class DbFacade
    {
        private static DbFacade instance;
        private readonly IObjectScope scope;
        private readonly ITransaction tx;

        private DbFacade()
        {
            scope = ScopeProvider.ObjectScope();

            tx = scope.Transaction;
            if (!tx.IsActive)
            {
                tx.Begin();
            }
        }

        public static DbFacade NewInstance()
        {
            return new DbFacade();
        }

        public static DbFacade GetInstance()
        {
            if (instance == null)
            {
                instance = new DbFacade();
            }

            return instance;
        }
                        
        private IEnumerable<T> RetreiveData<T>(IEnumerable<T> result)
        {
            //...
        }

        public void Put<T>(T entity)
        {
            //...        }

        public void Remove<T>(T entity)
        {
            //...
        }

            //...
            //...       
    }