public static void ShowLoader(bool show, Form form)
        {
            form.Enabled = !show; //блокировка формы
            if (show)
            {
                SplashScreenManager.ShowForm(form, typeof(frmWait), true, true, false);
                
                SplashScreenManager.Default.SendCommand(CIW.frmWait.WaitFormCommand.SetProgress, 1);
                Thread.Sleep(25);
            }
            else
            {
                SplashScreenManager.CloseForm(false);
            }
        }

Program.ShowLoader(true, this);

Program.ShowLoader(false, this);