รบกวนช่วยตรวจสอบ Code สำหรับ Print Barcode ครับ มันยิงไม่ได้

Imports System.Drawing.Printing
Public Class Form_Print_Barcode
    Dim w, q As Double
    Dim dd, ss, rr, tt, a, b, z, n, n3, v, h, i, j, u, k, g, o As Integer
    Dim printFont As New Font _
    ("3 of 9 Barcode", 36, System.Drawing.FontStyle.Regular)
    Dim printFont2 As New Font _
    ("Angsana New", 22, System.Drawing.FontStyle.Regular)
    Dim iPage As Integer = 1
    Dim str As String
    Private WithEvents docToPrint As New Printing.PrintDocument
    Private Sub Form_Print_Barcode_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Num1.Text = 23
        Num3.Text = ""
        Me.KeyPreview = True
    End Sub

    Private Sub OK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK.Click
        Try

            k = Convert.ToInt32(Num1.Text)
            If (k < 10 And Num1.Text.Length < 2) Then
                Num1.Text = "0" & Num1.Text
            End If
            g = Convert.ToInt32(Num3.Text)
            If (Num2.Text <> "" And Num3.Text <> "") Then

                Num2.Text = Val(Num2.Text)
                j = Convert.ToInt32(Num2.Text)
                If (j < 10) Then
                    Num2.Text = "0" & Num2.Text
                End If

                dd = 33 : ss = 40 : rr = 70 : tt = 95 : a = 1 : n = 0 : h = 0 : v = 0 : i = 0 : z = 0
                n3 = Convert.ToInt32(Num3.Text)
                q = n3 / 44
                w = Math.Ceiling(q)
                PrintPreviewControl1.Rows = w
                PrintPreviewControl1.Columns = 3
                PrintPreviewControl1.Zoom = 0.75
                PrintPreviewControl1.Columns = 1
                PrintPreviewControl1.Document = PrintDocument1
                PrintPreviewControl1.InvalidatePreview()

            End If

        Catch ex As Exception
            MessageBox.Show("กรุณาตรวจสอบรหัสและใส่รหัสใหม่อีกครั้ง", "กรุณากรอกรหัสใหม่", MessageBoxButtons.OK, MessageBoxIcon.Warning)
            Num3.Text = ""

        End Try


    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        dd = 33 : ss = 40 : rr = 70 : tt = 95 : a = 1 : n = 0 : h = 0 : v = 0 : i = 0 : z = 0
        n3 = Convert.ToInt32(Num3.Text)
        q = n3 / 44
        w = Math.Ceiling(q)
        Dim ps As New Printing.PrinterSettings

        PrintDocument1.PrinterSettings.MinimumPage = 1
        PrintDocument1.PrinterSettings.MaximumPage = w
        PrintDocument1.PrinterSettings.FromPage = 2
        PrintDocument1.PrinterSettings.ToPage = 2
        If PrintDialog1.ShowDialog = DialogResult.OK Then
            PrintDocument1.Print()
        End If

    End Sub

    Private Sub PrintDocument1_PrintPage_1(ByVal sender As System.Object, ByVal x As System.Drawing.Printing.PrintPageEventArgs) Handles PrintDocument1.PrintPage
        Try
            n = a + 4
            If (w = 1 And h = 0) Then
                h += 1
                v = Convert.ToInt32(Num3.Text)
            ElseIf (w > 1 And h = 0) Then
                h += 1
                v = 44
            End If
            While (a <= v)
                i = a
                While (a < n)
                    If (a < 10) Then
                        str = Num1.Text & Num2.Text & "0" & a
                    Else
                        str = Num1.Text & Num2.Text & a
                    End If
                    x.Graphics.DrawString(str, printFont, _
                    System.Drawing.Brushes.Black, dd, ss)
                    dd += 190
                    a += 1
                    If (a > n3) Then
                        Exit While
                    Else
                    End If
                End While
                a = i
                While (a < n)
                    If (a < 10) Then
                        str = Num1.Text & Num2.Text & "0" & a
                    Else
                        str = Num1.Text & Num2.Text & a
                    End If
                    x.Graphics.DrawString(str, printFont2, _
                    System.Drawing.Brushes.Black, tt, rr)
                    tt += 192
                    a += 1
                    If (a > n3) Then
                        Exit While
                    Else
                    End If
                End While
                ss += 100
                rr += 100
                dd = 33
                tt = 95
                n = a + 4
            End While
            z += 1
            If (z < w) Then
                x.HasMorePages = True
            End If
            dd = 33
            ss = 40
            rr = 70
            tt = 95
            If ((n3 - a) < 44) Then
                v = n3
            ElseIf ((n3 - a) > 44) Then
                v += 44
            Else

            End If

        Catch ex As Exception
            MessageBox.Show("กรุณาตรวจสอบรหัสและใส่รหัสใหม่อีกครั้ง", "กรุณากรอกรหัสใหม่", MessageBoxButtons.OK, MessageBoxIcon.Warning)
            Num1.Text = ""
            Num3.Text = ""
           
        End Try


    End Sub
    


End Class