public void buttonEmployeeAdd_Click(object sender, RoutedEventArgs e) { CreateEmployee createEmployee = new CreateEmployee(employees); createEmployee.ShowDialog(); lvEmployees.ItemsSource = employees.EmployeesList; this.TotalSalaryCost.Text = "$" + employees.TotalSalaryCost.ToString(); this.AverageSalary.Text = "$" + employees.AverageSalary.ToString(); }