@EventHandler(EventPriority.NORMAL, true)
public void HandlePlayerLoginEvent(PlayerLoginEvent event)
{
    /// Do whatever you want here.
}

public class MyHandleService
{
public:
    void HandlePlayerLoginEvent(PlayerLoginEvent event)
    {
         /// Do whatever you want here.
    }
    void HandlePlayerLoginEventTwo(PlayerLoginEvent event)
    {
         /// Do whatever you want here.
    }
};

auto instance = new MyHandleService;

EventManager.registerHandler!HandlePLayerLoginEvent(plugin);
EventManager.registerHandler!HandlePlayerLoginEvent(plugin, instance);
EventManager.registerHandler!HandlePlayerLoginEvent2(plugin, instance);