How to see Print Preview & Print a WindowsForm

using System.Drawing.Printing;  //For "PrintDocument" Class

public partial class Form3 : Form
    {
        PrintDocument PrintDoc1 = new PrintDocument();
        PrintPreviewDialog PPDlg1 = new PrintPreviewDialog();
       
        public Form3()
        {
            InitializeComponent();

            PPDlg1.Document = PrintDoc1;
            PrintDoc1.OriginAtMargins =true; //To set or Get the Position of a Graphic Object
            PrintDoc1.PrintPage += PDoc_PrintPage;
        }         
       
        private void btn_PrintPreview_Click(object sender, EventArgs e)
        {// When PrintPreview Button Clicks
            PPDlg1.ShowDialog();           
        }

        private void PDoc_PrintPage(object sender, PrintPageEventArgs e)
        {
            Bitmap bmp = new Bitmap(this.Width, this.Height);
            //this.DrawToBitmap(bmp, this.ClientRectangle);
            this.DrawToBitmap(bmp, new Rectangle(0, 0, bmp.Width, bmp.Height)); //Takes the Snap of the Exact WindowForm size as Bitmap image
            e.Graphics.DrawImage(bmp, 0, 0);
        }

        private void btn_PrintPage_Click(object sender, EventArgs e)
        {//When Print Button Clicks, Image will be show & Ready to Print
            PrintDoc1.Print();
        }

    }