How to print part of the window form in c# window application?

You need to use the class System.Drawing.Printing.PrintDocument. The idea of using it is: you obtain an instance of the class System.Drawing.Graphics and render all the graphical primitive you need.

See the code sample here:
http://msdn.microsoft.com/en-us/library/system.drawing.printing.printdocument(v=VS.100).aspx[^], it explains everything.

Also, look at this article:
Simplified .NET Printing in C#[^].

—SA

Its working, try this code :)

private void button1_Click(object sender, EventArgs e)
       {
           PrintDocument doc = new PrintDocument();
           doc.PrintPage += this.Doc_PrintPage;
           PrintDialog dlgSettings = new PrintDialog();
           dlgSettings.Document = doc;
           if (dlgSettings.ShowDialog() == DialogResult.OK)
           {
               doc.Print();
           }
       }

private void Doc_PrintPage(object sender, PrintPageEventArgs e)
        {
             float x = e.MarginBounds.Left;
              float y = e.MarginBounds.Top;
            Bitmap bmp = new Bitmap(this.groupBox1.Width, this.groupBox1.Height);
            this.groupBox1.DrawToBitmap(bmp, new Rectangle(0, 0, this.groupBox1.Width, this.groupBox1.Height));
            e.Graphics.DrawImage((Image)bmp, x, y);
        }

Just drag the Printform tool from the toolbox , it comes under visual power pack,and then in your onclick event add these simple code


{
groupbox.visible="True" // depends on our requirement
this.printForm.print();
}

And if you want to see the print preview just Right click on printform tool > set its print property to "Print to preview"