Queue how to make the GetNextItem

[Tazsweet19]

I try to make to set up

public Datas getData()
{
   Node node;
   if (Process.TryDequeue(out node))
     return node.getdata();
   else if (downloads.tryDequeue(out node))
     return node.getdata();
   else
     return null;
}

public void GetNextItemToADD()
{
  ConcurrentQueue<Node>.GetNextItemToProcess();
}

I think I am wrong.. I try to find example for GetNextItem. I want to know. Thanks