c#绘制到图像中

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
namespace WindowsApplication2
{
    public partial class Form20 : Form
    {
        public Form20()
        {
            InitializeComponent();
        }
        private void Form20_Load(object sender, EventArgs e)
        {
        }
        private void button1_Click(object sender, EventArgs e)
        {
            Rectangle rect = new Rectangle(0, 0, 100, 100);
            Graphics dg = this.CreateGraphics();
            Image image = new Bitmap(rect.Width, rect.Height, dg);
            Graphics ig = Graphics.FromImage(image);
            ig.FillRectangle(Brushes.Black, rect);
            Font font = new Font("Arial", 12);
            Brush brush = System.Drawing.Brushes.White;
            ig.DrawString("zhuzhao", font, brush,0, 0);
            //ImageFormat iformat=new ImageFormat(new Guid(Bmp)); 
            image.Save(@"c:/image.png");
            dg.DrawImage(image,new PointF(100,100));
        }
    }
}