C#: How do you access an object instance?

Question

I created a splash class with a timer on it, and when the timer is finished it instances another class as shown in the code below. When i then create a new class how can i access MainWindow?

namespace Kinetics
{
    public class KineticsCommand : RMA.Rhino.MRhinoCommand
    {
       Splash Splash = new Splash();
       Splash.Show();
    }

    public partial class Splash : Form
    {
        public Splash()
        {
            InitializeComponent();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            this.Close();

            MainUI MainWindow = new MainUI();
            MainWindow.Show();
        }
    }

    public class CustomEventWatcher : MRhinoEventWatcher
    {
        public override void OnReplaceObject(ref MRhinoDoc doc, ref MRhinoObject old, ref MRhinoObject obj)
        {
           // How can i access the class from here?
        }
    }
}

Answer 1

CustomEventWatcher will need a reference to MainWindow, for example via a property within CustomEventWatcher:

public class CustomEventWatcher : MRhinoEventWatcher
{
    MainUI _mainUI = null;
    public MainUI MainWindow { get { return _mainUI; } set { _mainUI = value; } }

    public override void OnReplaceObject(ref MRhinoDoc doc, ref MRhinoObject old, ref MRhinoObject obj)
    {
       if(_mainUI != null)
           _mainUI.Whatever();
    }
}

public partial class Splash : Form
{
    public Splash()
    {
        InitializeComponent();
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        this.Close();

        MainUI MainWindow = new MainUI();
        CustomEventWatcher cew = new CustomEventWatcher();
        cew.MainWindow = MainWindow;
        MainWindow.Show();
    }
}