protected void search_Click(object sender, EventArgs e)
        {
            ManagementService service = new ManagementService();
            List<ManagementService.Person> people = service.GetColleagues(firstName.Text, lastName.Text);

            if (people == null || people.Count == 0)
            {
                result.Text = "Not Found";
            }

            else
            {
                StringBuilder resultString = new StringBuilder();
                foreach (ManagementService.Person person in people)
                {
                    resultString.AppendLine(person.ToString());
                }
                result.Text = resultString.ToString();
            }
        }