problem with Large Memory

public class MyObject
{  
  System.Timers.Timer LostTimer = new System.Timers.Timer();
  public int ID;
  public DateTime UpdateTime;

  public  MyObject()
  {
    LostTimer.Interval = 20000;
    LostTimer.Elapsed+=TimerElapsedHandler(LostTimer_Elapsed);
    LostTimer.Enabled = true;
  }
 
  void LostTimer_Elapsed(object sender,EventArgs e)
  {
    if(UpdateTime > DateTime.Now.AddSeconds(-20))
         Console.WriteLine(ID + " Lost...");
  }
  
}

public class MyClass
{
  public MyClass(){}

  private ConcurrentDictionary<int,MyObject> Objects = new ConcurrentDictionary<int,MyObject>();

  void NetworkThread1DataRecived(eventArgs e)
  {
    Translate(e.Data);
  }
  void Translate(string[] data)
  {
   Task.Factory.StartNew(()=>
   {
      Parallel.ForEach<string>(data, s (()=>
      {
         MyObject o = null;
         Objects.TryGet(int.Parse(s),out o)
         if(o == null)
         {       
             o = new MyObject();
             o.ID = int.Parse(s);
             o.UpdateTime = DateTime.Now;
         
             Objects.TryAdd(s,o);
         }
         else
         {
            o.UpdateTime = DateTime.Now;
         }
      });
   });
 }
}