how to set custom page size? please give ans

[vishalsohaliya]

_settings = new ScanSettings();
_settings.Page = new PageSettings();
_settings.Resolution = new ResolutionSettings();
_settings.UseDocumentFeeder = useAdfCheckBox.Checked;
_settings.ShowTwainUI = useUICheckBox.Checked;
_settings.ShowProgressIndicatorUI = showProgressIndicatorUICheckBox.Checked;
_settings.UseDuplex = useDuplexCheckBox.Checked;
_settings.Resolution.Dpi = 800;
_settings.Page.Size = TwainDotNet.TwainNative.PageType.MaxSize;

                   **hello i want to set custom page size like (1527,800)**