public USERSbl GetUserByMail(string mail)
 {
     using (USERScrud db = new USERScrud())
     {
         return db.GetUserByMail(mail);
     }
 }
 public List<USERSbl> GetAllUsers()
 {
     using (USERScrud db = new USERScrud())
     {
         return db.GetAllUsers();
     }
 }