主题：[求助]确定打印后，怎么防止打印被取消？

 If MessageBox.Show("确定打印吗?","",MessageBoxButtons.YesNo,MessageBoxIcon.Question) = DialogResult.Yes Then
    Dim Pnl As WinForm.Panel = e.Form.Controls("Panel1")
    Dim doc As PrintDoc = e.Form.GernatePrintDoc(Pnl)
    Dim ptime As Date = Date.Now
    doc.Preview
    Dim sp As TimeSpan = Date.now-ptime
    If sp.TotalMilliseconds < 1000 Then
        doc.Preview
    End If
    'msgbox(sp.TotalMilliseconds)
End If