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我用Winforms应用程序中输入的值创建了一个条形码，并用打印机打印。之后，当我想用条形码阅读器扫描它时，我无法扫描它。这是我的代码：

private void GenerateBarcodeButton_Click(object sender, EventArgs e)
{
    if (!String.IsNullOrEmpty(textBox1.Text))
    {
        pictureBox1.Image = Zen.Barcode.BarcodeDrawFactory.Code128WithChecksum.Draw(textBox1.Text, 50, 2);
    }
    else
    {
        MessageBox.Show("Please enter the barcode number you want to generate.");
    }
}
public void PrintPicture(object sender, PrintPageEventArgs e)
{
    Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
    // bmp.SetResolution(203, 203);
    pictureBox1.DrawToBitmap(bmp, new Rectangle(0, 0, pictureBox1.Width, pictureBox1.Height));
    e.Graphics.DrawImage(bmp, 20, 20, new System.Drawing.RectangleF(0, 0, bmp.Width, bmp.Height), System.Drawing.GraphicsUnit.Pixel);
}

private void Print_Click(object sender, EventArgs e)
{
    PrintDialog pd = new PrintDialog();
    PrintDocument pDoc = new PrintDocument();
    pDoc.PrintPage += PrintPicture;
    pd.Document = pDoc;
    if (pd.ShowDialog() == DialogResult.OK)
    {
        pDoc.Print();
    }
}

我用于打印的打印机型号是Godex G300，我哪里出错了？