private async Task UpdateVendors()
        {
            _vendors.Clear();

            var allVendors = await _vendorData.LoadAllVendors();

            allVendors = allVendors.OrderBy(x => x.LastName).ToList();

            foreach (var vendor in allVendors)
            {
                _vendors.Add(vendor);
            }

            listBoxVendors.DataSource    = _vendors;
            listBoxVendors.DisplayMember = "FullName";
            listBoxVendors.ValueMember   = "FullName";
        }
        private async Task UpdateVendors()
        {
            _vendors.Clear();

            var allVendors = await _vendorData.LoadAllVendors();

            allVendors = allVendors.OrderBy(x => x.LastName).ToList();

            foreach (VendorModel v in allVendors)
            {
                _vendors.Add(v);
            }

            vendorListBox.DataSource    = _vendors;
            vendorListBox.DisplayMember = "Display";
            vendorListBox.ValueMember   = "Display";

            _vendors.ResetBindings();
        }