Termical打印机剪切了文本vb.net

Question

我正在开发一个打印产品列表的应用程序。我正在寻找信息并使用此代码进行打印：

e.Graphics.DrawString("Products", printFont, System.Drawing.Brushes.Black, 25, YPosition)
YPosition += 80
e.Graphics.DrawString(fechaHora, printFont, System.Drawing.Brushes.Black, 25, YPosition)
YPosition += 40
e.Graphics.DrawString("Nmp: " + npedido, printFont, System.Drawing.Brushes.Black, 25, YPosition)
YPosition += 40

If special <> "" Then
      e.Graphics.DrawString(special, printFontTitulo, System.Drawing.Brushes.Black, 425, YPosition)
      YPosition += 40
End If

e.Graphics.DrawString("==============================================", printFont, System.Drawing.Brushes.Black, 25, YPosition)
YPosition += 40
e.Graphics.DrawString("==============================================", printFont, System.Drawing.Brushes.Black, 25, YPosition)
YPosition += 40

For i = 0 To lst_products.Items.Count - 2
     e.Graphics.DrawString(lst_products.Items.Item(i) + " (" + lst_price.Items.Item(i) + ")", printFont, System.Drawing.Brushes.Black, 25, YPosition)
     YPosition += 40
Next

当产品列表包含20种产品时，问题就出现了，纸张的高度与A4类似，并且停止打印。

我不知道问题是打印机还是我的代码。

感谢您的帮助。