To see Print Preview & Print a WindowsForm, Code in VB.Net

PrintDoc1.PrintPage += PDoc_PrintPage;
Private PrintDoc1 As PrintDocument = New PrintDocument    
Private PrintPreviewDialog1 As PrintPreviewDialog = New PrintPreviewDialog

Private Sub btn_PrintPreview_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_PreviewButton.Click  'When PrintPreview Button Clicks
        
    PrintPreviewDialog1.Document = PrintDoc1
   'To set or Get the Position of a Graphic Object
    PrintDoc1.OriginAtMargins = True
   'PrintDoc1.PrintPage += PDoc_PrintPage;        
    PrintPreviewDialog1.ShowDialog()        
End Sub

    
Private Sub PDoc_PrintPage(ByVal sender As System.Object, ByVal e As PrintPageEventArgs)        
        
    Dim bmp As Bitmap = New Bitmap(Me.Width, Me.Height)
        
   'this.DrawToBitmap(bmp, this.ClientRectangle);
    Me.DrawToBitmap(bmp, Me.ClientRectangle)
      
   'Takes the Snap of the Exact WindowForm size as Bitmap image
    Me.DrawToBitmap(bmp, New Rectangle(0, 0, bmp.Width, bmp.Height))        
    e.Graphics.DrawImage(bmp, 0, 0)       
End Sub

In C# Code