C# ช่วยเรื่องคำสั่งปริ้นหน่อยครับ ด้วยครับผม เรื่อง ขนาดอ่ะครับ

    Dim memoryImage
    Private Declare Auto Function BitBlt Lib "GDI32.DLL" (ByVal hdcDest As IntPtr, ByVal nXDest As Integer, ByVal nYDest As Integer, ByVal nWidth As Integer, ByVal nHeight As Integer, ByVal hdcSrc As IntPtr, ByVal nXSrc As Integer, ByVal nYSrc As Integer, ByVal dwRop As Int32) As Boolean
    '======ปุ่มปริ้น
Private Sub btnPrintpreview_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPrintpreview.Click
        'dlgEmpOnline.Visible = False
        CaptureScreen()
        'lgEmpOnline.Visible = True
        PrintPreviewDialog1.Document = PrintDocument1
        PrintPreviewDialog1.ShowDialog()
    End Sub

'=========Sub แคปเจอร์===========
Private Sub CaptureScreen()
        Dim mygraphics As Graphics = Panel4.CreateGraphics() ' ---- เปลี่ยนเป็น GroupBox1.CreateGraphics()
        Dim s As Size = Panel4.Size ' ---- เปลี่ยนเป็น GroupBox1.Size

        memoryImage = New Bitmap(s.Width, s.Height, mygraphics)

        Dim memoryGraphics As Graphics = Graphics.FromImage(memoryImage)
        Dim dc1 As IntPtr = mygraphics.GetHdc
        Dim dc2 As IntPtr = memoryGraphics.GetHdc

        BitBlt(dc2, 0, 0, Panel4.ClientRectangle.Width, Panel4.ClientRectangle.Height, dc1, 0, 0, 13369376)
        mygraphics.ReleaseHdc(dc1)
        memoryGraphics.ReleaseHdc(dc2)

    End Sub

'========Printpage===================
    Private Sub PrintDocument1_PrintPage(ByVal sender As System.Object, ByVal e As System.Drawing.Printing.PrintPageEventArgs) Handles PrintDocument1.PrintPage
        e.Graphics.DrawImage(memoryImage, 10, 10)
    End Sub