用以下程序进行打印，有两个问题，1、无法换页打印，2、需打印的内容都打印在一张纸上。请各路高手给小弟指点密经！
Sub pd_print(ByVal sender As Object, ByVal e As PrintPageEventArgs)
        Dim fnt, fnt1 As Font
        fnt = New Font("黑体", 13)
        fnt1 = New Font("黑体", 15)
        e.PageSettings.Margins.Top = 0
        e.PageSettings.Margins.Left = 0
        Dim i, a As Long
        a = 14 ' 需打印的证数
        Dim f As String
        Dim k As Short = 0 '打印行
        Dim ycd As Short '打印的位置  
                For i = 1 To a
                    ycd = 70 + k * 275
                    k = k + 1
                    f = CStr(ycd) + "_" + CStr(i)
                    e.Graphics.DrawString(f, fnt, Brushes.Black, 22, ycd)
                    If ycd > 900 Then
                        k = 0
e.HasMorePages = True
                    End If
                Next              
                e.HasMorePages = False
                fnt.Dispose()
    End Sub

    Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim pd As New PrintDocument
        AddHandler pd.PrintPage, AddressOf Me.pd_print
        pd.Print()
    End Sub   
End Class