Close a document itext sharp

for(int i-=0; i<firstitems.size();>{
    table.addCell(String.valueOf(firstItems.get(z)));
    document.add(table);
    document.close();
    response.addHeader("Content-Disposition", "attachment; filename="test.pdf");
    OutputStream out = response.getOutputStream();
    baos.writeTo(out);
    out.flush();
}