private void AddContractorCmd(object model) { var contractor = model as Contractor; contractor.CreateDate = DateTime.Now; if (string.IsNullOrWhiteSpace(contractor.ContractorName)) { return; } _repositoryManager.AddContractor(contractor); ContractorToAdd = new Contractor(); var con = _repositoryManager.GetContractors(); Contractors = new ObservableCollection <Contractor>(con); ContractorList = ProcessContractorList(con); SelectedContractor = ContractorList.First(); }