A collection that returns items added in the last 60 seconds

gistfile1.cs

void Main()
{
	var timeStorage = new TimeStorage();
	var item = "Hello World";
	
	timeStorage.Add(item);
	
	var items = timeStorage.GetItems();
	items.Dump();
}

public class TimeStorage
{
	private BindingList<TimeStorageItem> items;
	
	private const int TimeoutMilliseconds = 60000;
	
	public TimeStorage()
	{
		items = new BindingList<TimeStorageItem>();
		items.ListChanged += (object sender, ListChangedEventArgs  e) => {
			var item = (BindingList<TimeStorageItem>)sender;
			// Decide when and if to do a cleanup
		};
	}
	
	public void Add(object item)
	{
		items.Add(new TimeStorageItem(item));
	}
	
	public IEnumerable<TimeStorageItem> GetItems()
	{
		return items
		.Where(x => DateTime.Now.Subtract(x.AddedOn).TotalMilliseconds < TimeoutMilliseconds);
	}
}

public class TimeStorageItem
{
	public DateTime AddedOn{get; private set;}
	public object Item{get; private set; }
	
	public TimeStorageItem(object item)
	{
		this.Item = item;
		this.AddedOn = DateTime.Now;
	}
}

// Define other methods and classes here