如何在c#中使用abcpdf更改pdf表单字段中的字体样式？

如何使用abcpdf和c#？

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 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Web.UI;
 using System.Web.UI.WebControls;
 using System.Drawing;
 using System.Text;
 using System.Net;
 using System.IO;
 using WebSupergoo.ABCpdf8;

 namespace ABCpdfExamples
{
     public partial class test : System.Web.UI.Page
   {
          protected void Page_Load(object sender, EventArgs e)
         {           
            // ---- Adds a font reference to the document ----
            Doc doc = new Doc();
            doc.FontSize = 48;
            string theFont = "Times-Roman ";
            doc.Font = doc.AddFont(theFont);
            doc.AddText(theFont);
            theFont = "Helvetica-Bold";
            doc.Font = doc.AddFont(theFont);
            doc.AddText(theFont);
            doc.Save(Server.MapPath("~/Results/Output.pdf"));
            doc.Clear();
         }
     }
 }