как распечатать groupbox ( vb.net )

using System;
using System.Drawing;
using System.Drawing.Printing;
using System.Windows.Forms;

namespace WindowsFormsApplication16
{
    public partial class Form1 : Form
    {
        [System.Runtime.InteropServices.DllImport("gdi32.dll")]
        public static extern long BitBlt(IntPtr hdcDest, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hdcSrc, int nXSrc, int nYSrc, int dwRop);
        private Bitmap memoryImage;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
        }

        private void button3_Click(object sender, EventArgs e)
        {
            Graphics mygraphics = this.groupBox1.CreateGraphics();
            Size s = this.groupBox1.Size;
            memoryImage = new Bitmap(s.Width, s.Height, mygraphics);
            Graphics memoryGraphics = Graphics.FromImage(memoryImage);
            IntPtr dc1 = mygraphics.GetHdc();
            IntPtr dc2 = memoryGraphics.GetHdc();
            BitBlt(dc2, 0, 0, groupBox1.ClientRectangle.Width, groupBox1.ClientRectangle.Height, dc1, 0, 0, 13369376);
            mygraphics.ReleaseHdc(dc1);
            memoryGraphics.ReleaseHdc(dc2);
           
            PrintDocument printDocument = new PrintDocument();
            printDocument.PrintPage += new PrintPageEventHandler(printDocument_PrintPage);
            PrintPreviewDialog dlg = new PrintPreviewDialog();
            dlg.Document = printDocument;
            dlg.ShowDialog();

            //printDocument.Print();
        }

        void printDocument_PrintPage(object sender, PrintPageEventArgs e)
        {
            Rectangle destRect = new System.Drawing.Rectangle(100, 100, groupBox1.Width, groupBox1.Height);
            e.Graphics.DrawImage(memoryImage, destRect, 0, 0, memoryImage.Width, memoryImage.Height, System.Drawing.GraphicsUnit.Pixel);
        }
    }
}

public void DrawToBitmap(Bitmap bitmap, Rectangle targetBounds);