PrintDialog myPrintDialog = new PrintDialog();
System.Drawing.Bitmap memoryImage = new System.Drawing.Bitmap(panel1.Width, panel1.Height);
panel1.DrawToBitmap(memoryImage, panel1.ClientRectangle);
if (myPrintDialog.ShowDialog() == DialogResult.OK)
{
System.Drawing.Printing.PrinterSettings values;
values = myPrintDialog.PrinterSettings;
myPrintDialog.Document = printDocument1;
printDocument1.PrintController = new StandardPrintController();
printDocument1.Print();
}
printDocument1.Dispose();

 //declare event handler for printing in constructor
        printdoc1.PrintPage += new PrintPageEventHandler(printdoc1_PrintPage);

    //Rest of the code
    Bitmap MemoryImage;
    public void GetPrintArea(Panel pnl)
    {
        MemoryImage = new Bitmap(pnl.Width, pnl.Height);
        pnl.DrawToBitmap(MemoryImage, new Rectangle(0, 0, pnl.Width, pnl.Height));
    }
    protected override void OnPaint(PaintEventArgs e)
    {
        if (MemoryImage != null)
        {
            e.Graphics.DrawImage(MemoryImage, 0, 0);
            base.OnPaint(e);
        }
    }
    void printdoc1_PrintPage(object sender, PrintPageEventArgs e)
    {
        Rectangle pagearea = e.PageBounds;
        e.Graphics.DrawImage(MemoryImage, (pagearea.Width / 2) - (this.panel1.Width / 2), this.panel1.Location.Y);
    }
    public void Print(Panel pnl)
    {
        pannel = pnl;
        GetPrintArea(pnl);
        previewdlg.Document = printdoc1;
        previewdlg.ShowDialog();
    }
    private void button1_Click(object sender, EventArgs e)
    {
        Print(this.panel1);
    }

Link :

https://social.msdn.microsoft.com/Forums/vstudio/en-US/872012ba-347f-4bb6-af1f-157b4025ee95/how-to-print-the-panel-and-its-content?forum=csharpgeneral

https://stackoverflow.com/questions/10605840/print-panel-in-windows-form-c-sharp

cái dưới có vẻ code khoa học hơn, bạn có thể đến tận trang để đọc xem thử, mình chỉ tìm giúp thôi, được thì tick cho mình nha :v

Thế cái Lưu panel thì làm kiểu gì bạn ơi!!!!