void Employees_SaveCollectionCompleted(object sender, Employees_SaveCollectionCompletedEventArgs e)
        {
            try
            {
                WorkingBar.Value = 100;
                Timer.Stop();

                RecordsAdded = 0;

                employees = e.Result;
                EmployeesDataGrid.ItemsSource = employees.Collection;
            }
            catch (Exception exc)
            {
                Console.WriteLine(exc.StackTrace);
            }
        }
        void Employees_SaveCollectionCompleted(object sender, Employees_SaveCollectionCompletedEventArgs e)
        {
            try
            {
                WorkingBar.Value = 100;
                Timer.Stop();

                RecordsAdded = 0;

                employees = e.Result;
                EmployeesDataGrid.ItemsSource = employees.Collection;
            }
            catch (Exception exc)
            {
                Console.WriteLine(exc.StackTrace);
            }
        }