private void disableEmployeeButton_Click(object sender, RoutedEventArgs e)
        {
            String firstName = inputFirstNameBox.Text;
            String lastName  = inputLastNameBox.Text;

            // verify valid name fields
            if (String.IsNullOrEmpty(firstName) || String.IsNullOrEmpty(lastName))
            {
                ClearAll();
                outputTextBlock.Text = "Please enter both first and last names";
                return;
            }

            try
            {
                SqlManage.DisableEmployee(firstName, lastName);
            }
            catch (SqlException ex)
            {
                ClearAll();
                outputTextBlock.Text = ex.Message;
            }
            catch (IOException ex)
            {
                ClearAll();
                outputTextBlock.Text = ex.Message;
            }

            ClearAll();
            outputTextBlock.Text = String.Format("Disabled {0} {1}",
                                                 firstName, lastName);
        }