public void SetPictureNull()
{
    MessageBox.Show("Called");
    Dispose();
    Hide();
    picMostRecent.Image = null;
    picRandomAircraft.Image = null;
    Thread.Sleep(5000);
}

public void SetPictureNull()
{
    MessageBox.Show("Called");
    Dispose();
    Hide();
    picMostRecent.Image = null;
    picRandomAircraft.Image = null;
    Thread.Sleep(5000);
}

        private Home home;
        public void Application_Exit(object sender, EventArgs e)
        {
            if (home != null)
            {
                home.SetPictureNull();
            }

            MessageBox.Show("Application Exit Called");
            MessageBox.Show("Number of paths to delete: " + imagePathsToDelete.Count);

            string exePath = AppDomain.CurrentDomain.BaseDirectory;

            foreach (var relativePath in imagePathsToDelete)
            {
                string fullImagePath = Path.Combine(exePath, relativePath);

                if (System.IO.File.Exists(fullImagePath))
                {
                    try
                    {
                        GC.Collect();
                        GC.WaitForPendingFinalizers();

                        MessageBox.Show("Deleting file: " + fullImagePath);
                        System.IO.File.Delete(fullImagePath);
                        MessageBox.Show("Deleted: " + fullImagePath);
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show("Error deleting file: " + ex.Message);
                    }
                }
                else
                {
                    MessageBox.Show("File not found: " + fullImagePath);
                }
            }

            Application.Exit(); 
        }

        private Home home;
        public void Application_Exit(object sender, EventArgs e)
        {
            if (home != null)
            {
                home.SetPictureNull();
            }

            MessageBox.Show("Application Exit Called");
            MessageBox.Show("Number of paths to delete: " + imagePathsToDelete.Count);

            string exePath = AppDomain.CurrentDomain.BaseDirectory;

            foreach (var relativePath in imagePathsToDelete)
            {
                string fullImagePath = Path.Combine(exePath, relativePath);

                if (System.IO.File.Exists(fullImagePath))
                {
                    try
                    {
                        GC.Collect();
                        GC.WaitForPendingFinalizers();

                        MessageBox.Show("Deleting file: " + fullImagePath);
                        System.IO.File.Delete(fullImagePath);
                        MessageBox.Show("Deleted: " + fullImagePath);
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show("Error deleting file: " + ex.Message);
                    }
                }
                else
                {
                    MessageBox.Show("File not found: " + fullImagePath);
                }
            }

            Application.Exit(); 
        }