AssistDB/Splash.cs

using System.Threading;
using System.Windows.Forms;
using System.Drawing;

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

        //Delegate for cross thread call to close
        private delegate void CloseDelegate();

        //The type of form to be displayed as the splash screen.
        private static Splash splashForm;

        static public void ShowSplashScreen(Point point, int height, int width)
        {
            // Make sure it is only launched once.    
            if (splashForm != null) return;
            splashForm = new Splash();
            splashForm.StartPosition = FormStartPosition.Manual;
            splashForm.Location = new Point(width / 2 - splashForm.Width / 2 + point.X,
                          height / 2 - splashForm.Height / 2 + point.Y); ;
            Thread thread = new Thread(new ThreadStart(Splash.ShowForm));
            thread.IsBackground = true;
            thread.SetApartmentState(ApartmentState.STA);
            thread.Start();
        }

        static private void ShowForm()
        {
            if (splashForm != null) Application.Run(splashForm);
        }

        static public void CloseForm()
        {
            Thread.Sleep(20);
            splashForm?.Invoke(new CloseDelegate(Splash.CloseFormInternal));
            
        }

        static private void CloseFormInternal()
        {
            if (splashForm != null)
            {
                splashForm.Close();
                splashForm = null;
            };
        }
    }
}