public int Dequeue()
{
if (firstItem != null)
{
var returnItem = firstItem.Value;
firstItem = firstItem.NextItem;
return returnItem.Value;
}
throw new ActionNotAllowedException();
}
public void Enqueue(int i)
{
if (firstItem == null)
{
firstItem = new item(i);
lastItem = firstItem;
}
else
{
var newItem = new item(i);
lastItem.NextItem = newItem;
lastItem = newItem;
}
}