public void SetCurrentBill(BillDisplay bill)
        {
            currentBill = bill;

            LoadAllServices();
            LoadAllCustomers();
            LoadAllEmployees();

            if (bill.Id != 0)
            {
                LoadBillsServices();
                currentDetails = LessLazyWorker.GetBillDetails(currentBill.Id);

                CustomerComboBox.SelectedValue = bill.Customer_.Id;
                EmployeeComboBox.SelectedValue = bill.Employee_.Id;

                SaveBillButton.Enabled           =
                    DeleteBillButton.Enabled     =
                        ExportBillButton.Enabled =
                            true;

                AddServiceButton.Enabled            =
                    SaveServiceButton.Enabled       =
                        RemoveServiceButton.Enabled =
                            true;
            }
            else
            {
                LoadBillsServices(new List <ServiceMapped>());
                currentDetails = new List <BillDetail>();

                CustomerComboBox.SelectedIndex = 0;
                EmployeeComboBox.SelectedIndex = 0;

                SaveBillButton.Enabled           =
                    DeleteBillButton.Enabled     =
                        ExportBillButton.Enabled =
                            false;

                AddServiceButton.Enabled            =
                    SaveServiceButton.Enabled       =
                        RemoveServiceButton.Enabled =
                            false;
            }
        }