C#

abstract class Foo
{
}

class Bar1 : Foo
{
}

class Bar2 : Foo
{
}

class Program
{
    static void Main(string[] args)
    {
        Dictionary<string, Foo> foos = new Dictionary<string, Foo>();
        for(int i = 0; i < 5; i++)
           foos.Add("Bar1." + i, new Bar1());

        for (int i = 0; i < 10; i++)
           foos.Add("Bar2." + i, new Bar2());

        List<Bar2> bar2List = new List<Bar2>();
        foreach (Foo foo in foos.Values)
        {
            if(foo is Bar2)
            {
                bar2List.Add((Bar2)foo);
            }
        }
    }
}

<br />
Event one occurs --> text box updated --> after 10 seconds --> text box back to normal

Thread t = new Thread(keep_run);

public void update()
{
    t.Interrupt();
    if (MessageLbl.InvokeRequired)
    {
        MessageLbl.Invoke(new setText(() => MessageLbl.Text = "User settings have been updated."));
    }
    else
    {
        MessageLbl.Text = "User settings have been updated.";
    }

    t = new Thread(keep_run);
    t.Start();
}

private void keep_run()
{
    try
    {
        Thread.Sleep(10000);
        MessageLbl.Invoke(new setText(() => MessageLbl.Text = "Welcome to MAT Downloader"));
    }
    catch { MessageBox.Show("Interrupted"); }
}
}