public ProductRepository()
 {
     Conn = new Connection();
 }
 public TaskRepository()
 {
     Conn = new Connection();
 }
 public SectionRepository()
 {
     Conn = new Connection();
 }
 public PresetRepository()
 {
     Conn = new Connection();
 }
 public GreenhouseRepository()
 {
     Conn = new Connection();
     Usernames = new List<string>();
 }