WPF DelegateCommand CanExecute

 private DelegateCommand searchCommand;

        public DelegateCommand SearchCommand

        {

            get

            {

                if (null == searchCommand)

                {

                    searchCommand = new DelegateCommand(Search, CanSearchExecute);

                }

                return searchCommand;

            }

        }

        private bool CanSearchExecute()

        {

            return CanSearch;

        }