public void Dispose()
{
if (_disposed)
{
return;
}
PdfiumLibrary.FORM_DoPageAAction(Page, _form, FPDFPAGE_AACTION.CLOSE);
PdfiumLibrary.FORM_OnBeforeClosePage(Page, _form);
PdfiumLibrary.FPDFText_ClosePage(TextPage);
PdfiumLibrary.FPDF_ClosePage(Page);
_disposed = true;
}