public async Task BindContractor()
        {
            var contractorList = await contractorDataService.GetContractors(Settings.GeneralSettings);

            var list = contractorList.Where(c => c.DeleteDate == null).OrderByDescending(a => a.InsertDate).ToList();

            this.contractorList = new ObservableCollection <Contractor>(list);
        }
        public async Task BindContractor()
        {
            // var customerList = await this.ds.GetCustomers();
            var contractorList = await contractorDataService.GetContractors(Settings.GeneralSettings);

            var list = contractorList.Where(c => c.DeleteDate == null).ToList();

            this.contractorList = new ObservableCollection <Contractor>(list);
        }