private void ComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (comboBox.SelectedIndex != 0)
            {
                button_add.Enabled = false;

                currentPermission             = controller.GetPermission(Int32.Parse(comboBox.Text.Split(' ')[0]));
                textBox_permission_level.Text = currentPermission.Facility_access_level.ToString();
            }
            else
            {
                button_add.Enabled = true;

                textBox_permission_level.Text = "";
            }
        }