WPF_IsLocationGood

        private bool IsLocationGood()
        {
            //abort
            if (0 == this.dpiOld) return false;
            var factor = dpiNew / dpiOld;
            var widthDiff = Convert.ToInt32(SystemParameters.WorkArea.Width * factor) - SystemParameters.WorkArea.Width;
            var heightDiff = Convert.ToInt32(SystemParameters.WorkArea.Height * factor) - SystemParameters.WorkArea.Height;
            var r = new Rect(this.RenderSize);
            var rect = new RECT() { left = (int)r.Left, top = (int)r.Top, right = (int)r.Right, bottom = (int)r.Bottom };
            //Get handle to monitor that has the largest intersection with the rectangle.
            var handleMonitor = W32.MonitorFromRect(ref rect, W32.MONITOR_DEFAULTTONULL);
            if (IntPtr.Zero == handleMonitor) return false;
            uint dpiX = 0;
            uint dpiY = 0;
            var result = W32.GetDpiForMonitor(handleMonitor, MonitorDpiType.Default, ref dpiX, ref dpiY);
            if (IntPtr.Zero != result) return false;
            return (dpiX == dpiNew);
        }