public async Task AddConflict(string message)
 {
     BusinessManagerMessage domainMessage = new BusinessManagerMessage("", message, BusinessManagerMessageType.Conflict);
     await Task.Run(() => {
         _messages.Add(domainMessage);
     });
 }
 public async Task AddNotFound(string message)
 {
     BusinessManagerMessage domainMessage = new BusinessManagerMessage("", message, BusinessManagerMessageType.NotFound);
     await Task.Run(() => {
         if (!_messages.Any(c => c.BusinessManagerMessageType == BusinessManagerMessageType.NotFound))
         {
             _messages.Add(domainMessage);
         }
     });
 }