C#生成图片证件

sing System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            gethua();            
        }
    }
    protected void gethua()
    {
        Random random = new Random();
        Bitmap bt = new Bitmap(351, 402, PixelFormat.Format24bppRgb);
        Graphics g = Graphics.FromImage(bt);
        Font fn1 = new Font("Tahoma", 10, FontStyle.Bold);         
        Font fn = new Font("Tahoma", 9, FontStyle.Bold);     
        g.Clear(Color.Honeydew);
        g.DrawString("中国电子学会电子设计初级工程师认证考试名", fn1, Brushes.Black, new PointF(20, 20));
        g.DrawString("准 考 证", fn1, Brushes.Black, new PointF(140, 50));
        g.DrawString("准考证号", fn, Brushes.Black, new PointF(14, 85));
        g.DrawString("CIE09101080004", fn, Brushes.Black, new PointF(90, 85));
        g.DrawString("考生姓名", fn, Brushes.Black, new PointF(14, 115));
        g.DrawString("李晓杰", fn, Brushes.Black, new PointF(90, 115));
        g.DrawString("考生性别", fn, Brushes.Black, new PointF(14, 145));
        g.DrawString("男", fn, Brushes.Black, new PointF(90, 145));
        g.DrawString("身份证号", fn, Brushes.Black, new PointF(14, 175));
        g.DrawString("410381198408272032", fn, Brushes.Black, new PointF(90, 175));
        g.DrawString("考试时间", fn, Brushes.Black, new PointF(14, 205));
        g.DrawString("2007年11月30号", fn, Brushes.Black, new PointF(90, 205));
    &nbs