public string MountReport()
 {
     foreach (var item in machineService.List())
     {
         time = DateTime.Now - item.CreateDate;
         if (time.Minutes < limitTime)
         {
             OnLineMachine++;
         }
         else if (time.Minutes > limitTime && time.Minutes < limitTimeAlert)
         {
             AlertMachines++;
         }
         else
         {
             OffLineMachines++;
         }
     }
     return($"Machines Online {OnLineMachine} and Alert Machines {AlertMachines} and OffLine Machines {OffLineMachines}");
 }