（二）设置PDF纸张并在指定位置添加文字

代码如下：

// 创建指定纸张的PDF
    public void CreatePDF2()
    {
        Document document = new Document(PageSize.A5.Rotate());
        PdfWriter.GetInstance(document, new FileStream(Server.MapPath("~/PDF/Hello.pdf"), FileMode.Create));
        document.Open();
        for (int i = 0; i < 5; i++)
            document.Add(new Phrase("Hello,World!"));
        document.Close();
    }
    // 在PDF指定位置添加段落
    public void CreatePDF3()
    {
        Document document = new Document(PageSize.A5, 36, 72, 108, 100);
        PdfWriter.GetInstance(document, new FileStream(Server.MapPath("~/PDF/Hello.pdf"), FileMode.Create));
        document.Open();
        Paragraph paragraph = new Paragraph();
        paragraph.Alignment = Element.ALIGN_BOTTOM;
        for(int i=0;i<20;i++)
        {
            paragraph.Add("Hello World!");
        }
        document.Add(paragraph);
        document.Close();
    }