public DateTime GetDisplay_FirstWeek_Sunday()
        {
            List <Models.Preferences.Display> displays = db.GetAllWithChildren <Models.Preferences.Display>();

            Models.Preferences.Display display;
            if (displays == null || displays.Count <= 0)
            {
                display = new Models.Preferences.Display {
                    FirstWeek_Sunday = DateTime.Now.Subtract(new TimeSpan((int)DateTime.Now.DayOfWeek, 0, 0, 0))
                };
                db.InsertWithChildren(display);
            }
            else
            {
                display = displays[0];
            }
            return(display.FirstWeek_Sunday);
        }
        public void SetDisplay_FirstWeek_Sunday(DateTime fws)
        {
            List <Models.Preferences.Display> displays = db.GetAllWithChildren <Models.Preferences.Display>();

            Models.Preferences.Display display;
            if (displays == null || displays.Count <= 0)
            {
                display = new Models.Preferences.Display {
                    FirstWeek_Sunday = fws
                };
            }
            else
            {
                display = displays[0];
                display.FirstWeek_Sunday = fws;
            }
            db.DeleteAll <Models.Preferences.Display>();
            db.InsertWithChildren(display);
        }