Rework so employee dont use repos but servies

PointOfSale/Pos.Ui/Pos/Setting/Employee/AddEmployeeWindow.xaml.cs

@@ -11,7 +11,7 @@ using System.Windows.Input;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using System.Windows.Shapes;
-using Database.Repository;
+using Pos.Service;
 
 namespace Pos.Setting
 {
@@ -20,6 +20,9 @@ namespace Pos.Setting
     /// </summary>
     public partial class AddEmployeeWindow : Window
     {
+        private readonly EmployeeService _employeeService =
+            new EmployeeService();
+
         public AddEmployeeWindow()
         {
             InitializeComponent();
@@ -27,9 +30,19 @@ namespace Pos.Setting
 
         private void btnAdd_Click(object sender, RoutedEventArgs e)
         {
-            EmployeeRepository employeeRepository = new EmployeeRepository();
-            employeeRepository.Add(txtStaff.Text);
-            this.Close();
+            try
+            {
+                _employeeService.AddEmployee(txtStaff.Text);
+                Close();
+            }
+            catch (ArgumentException exception)
+            {
+                MessageBox.Show(
+                    exception.Message,
+                    "Ugyldig medarbejder",
+                    MessageBoxButton.OK,
+                    MessageBoxImage.Warning);
+            }
         }
     }
 }