public class Foo
{
    public event EventHandler SomeEvent;
    public Foo()
    {
        SomeEvent += FooHandlers.Foo_SomeEvent1;
        SomeEvent += FooHandlers.Foo_SomeEvent2;
    }

    public void RaiseEvents(EventHandler evt, EventArgs args)
    {
        var eventObj = evt;
        var listeners = eventObj.GetInvocationList();
        foreach (var listener in listeners)
        {
            var method = (EventHandler)listener;
            ThreadPool.QueueUserWorkItem(callBack => method(this, args));
            // Handlers will do a lot of things, so I don't want
            // them blocking the Main thread
        }
    }

    public void SomeMethod()
    {
        // do something here
        RaiseEvents(SomeEvent, new EventArgs());
    }
}

public static class FooHandlers
{
    public static void Foo_SomeEvent1(object sender, EventArgs e)
    {
        //do something here
    }
    public static void Foo_SomeEvent2(object sender, EventArgs e)
    {
        //do something different here
    }
}