public bool SetPageCropBox(int pageIndex, float left, float bottom, float right, float top) { if (_disposed) { throw new ObjectDisposedException(GetType().Name); } using (var pdfData = new PdfData(_document, _form, pageIndex)) { PdfiumLibrary.FPDFPage_SetCropBox(pdfData.Page, left, bottom, right, top); } return(true); }