DW5S/DW5S.App/Basic/IOverlayFormService.cs

using DevExpress.XtraSplashScreen;
using System.Windows.Forms;

public interface IOverlayFormService
{
    void ShowOverlayForm();
    void CloseOverlayForm();
}
public class OverlayFormService : IOverlayFormService
{
    private UserControl owner;
    private Form ownerForm;
    private IOverlaySplashScreenHandle handle;
    public OverlayFormService(UserControl owner)
    {
        this.owner = owner;
    }
    public OverlayFormService(Form owner)
    {
        this.ownerForm = owner;
    }
    public void CloseOverlayForm()
    {
        if (handle == null) return;
        SplashScreenManager.CloseOverlayForm(handle);
    }
    public void ShowOverlayForm()
    {
        if (owner != null)
            handle = SplashScreenManager.ShowOverlayForm(owner);
        if (ownerForm != null)
            handle = SplashScreenManager.ShowOverlayForm(ownerForm);
    }
}