Dim continuar As Boolean
        Dim wb1 As WebBrowser
        Dim cantidad As Integer
        cantidad = 0
nexti:
        If cantidad = 5 Then Exit Sub
        continuar = True
        wb1 = New WebBrowser
        wb1.Navigate("http://www.MISERVIDOR.com/form.php?1=1234567890")
        Do While continuar = True
            If wb1.CanGoBack Then
                continuar = False
                cantidad = cantidad + 1
                GoTo nexti
            End If
        Loop

        Dim wb1 As WebBrowser
        wb1 = New WebBrowser
        wb1.Navigate("http://www.google.com")

Private Sub wb1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles wb1.DocumentCompleted

Private Sub wb1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles wb1.DocumentCompleted, wb2.DocumentCompleted, wb3.DocumentCompleted

Private Sub GeraCodBar39(ByVal x As String, ByVal Sclr As Integer)
        Dim pic As PictureBox       
        Dim bc4(0 To 20) As String
        Dim barchar As String
        Dim barcolor As String
        Dim bs As Single
        Dim bwn As Single
        Dim ac As Integer
        Dim s As Integer
        Dim bct As Integer
        Dim bcl As Integer
        ac = 1
        pic.Image = Nothing
        bc4(ac - 1) = "121121211"
        For bct = 1 To Len(x)
            barchar = Mid(x, bct, 1)
            If barchar = " " Then barchar = "SP"
            For s = 0 To UBound(zz1)
                If UCase(barchar) = zz1(s) Then
                    bc4(ac) = zz2(s)
                    ac = ac + 1
                    Exit For
                End If
            Next s
        Next bct
        bc4(ac) = "121121211"
        bs = 200
        pic.DrawWidth = 1
        For bct = 0 To ac
            x = bc4(bct)
            barcolor = Color.Black.ToString
            For s = 1 To Len(x)
                bwn = (Val(Mid(x, s, 1))) * Sclr
                For bcl = 1 To bwn
                pic.Line (bs + bcl, 100)-Step(0, 500), barcolor
                    drawli()
                Next bcl
                If barcolor = Color.Black.ToString Then barcolor = Color.White.ToString Else barcolor = Color.Black.ToString
                bs = bs + bwn
            Next s
            For bcl = 1 To Sclr
                pic.Line (bs + bcl, 100)-Step(0, 500), vbWhite
            Next bcl
            bs = bs + bcl
        Next bct
        pic.FontSize = 16 : pic.CurrentX = 200 : pic.CurrentY = 600 : pic.Print(UCase(txtdata))
    End Sub

dr = cmd.ExecuteReader

if dr("codigo") = codigotxt.text & " 1" then

select id from medicamentos where codigo='2121 1';

select id from medicamentos where codigo like '2121 1';

Dim cn As OleDbConnection
Dim cmd As OleDbCommand
Dim dr As OleDbDataReader

Try
cn = New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & CurDir() & "\base.accdb;")
cn.Open()
cmd = New OleDbCommand("select id from articulos where codigo like '" & CodigoTxt.Text & " 1'", cn)
dr = cmd.ExecuteReader
MsgBox(dr("id"))
dr.close()
cn.close()
Catch ex As Exception
MsgBox(ex.Message)
End Try

PrintForm1.PrinterSettings.DefaultPageSettings.Margins.Top = 0
        PrintForm1.PrinterSettings.DefaultPageSettings.Margins.Left = 0
        PrintForm1.PrinterSettings.DefaultPageSettings.Margins.Right = 0
        PrintForm1.PrinterSettings.DefaultPageSettings.Margins.Bottom = 0
        PrintForm1.PrinterSettings.DefaultPageSettings.Landscape = False
        PrintForm1.Print(Me, PowerPacks.Printing.PrintForm.PrintOption.Scrollable)

Dim printdoc As PrintDocument
        printdoc = New PrintDocument
        AddHandler printdoc.PrintPage, AddressOf OnPrintPage
        printdoc.DefaultPageSettings.Margins.Top = 0
        printdoc.DefaultPageSettings.Margins.Left = 0
        printdoc.DefaultPageSettings.Margins.Bottom = 0
        printdoc.Print()

Public Class Win32APICall

    Public Const DIB_RGB_COLORS = 0
    Public Const BI_RGB = 0
    Public Const WHITENESS = 16711778

    <DllImport("user32.dll", EntryPoint:="PrintWindow", _
    SetLastError:=True, CharSet:=CharSet.Unicode, _
    ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
    Public Shared Function PrintWindow(ByVal hWnd As IntPtr, ByVal hDC As IntPtr, ByVal dwFlags As Integer) As UInt32
    End Function

    <StructLayout(LayoutKind.Sequential, pack:=8, CharSet:=CharSet.Auto)> _
    Structure BITMAPINFOHEADER
        Dim biSize As Int32
        Dim biWidth As Int32
        Dim biHeight As Int32
        Dim biPlanes As Int16
        Dim biBitCount As Int16
        Dim biCompression As Int32
        Dim biSizeImage As Int32
        Dim biXPelsPerMeter As Int32
        Dim biYPelsPerMeter As Int32
        Dim biClrUsed As Int32
        Dim biClrImportant As Int32
    End Structure

    <DllImport("gdi32.dll", EntryPoint:="CreateDIBSection", _
    SetLastError:=True, CharSet:=CharSet.Unicode, _
    ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
    Public Shared Function CreateDIBSection(ByVal hdc As IntPtr, ByRef pbmi As BITMAPINFOHEADER, _
    ByVal iUsage As Int32, ByVal ppvBits As IntPtr, ByVal hSection As IntPtr, _
    ByVal dwOffset As Int32) As IntPtr
    End Function

    <DllImport("gdi32.dll", EntryPoint:="PatBlt", _
    SetLastError:=True, CharSet:=CharSet.Unicode, _
    ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
    Public Shared Function PatBlt(ByVal hDC As IntPtr, ByVal nXLeft As Int32, _
        ByVal nYLeft As Int32, ByVal nWidth As Int32, ByVal nHeight As Int32, _
        ByVal dwRop As Int32) As Boolean
    End Function

    <DllImport("gdi32.dll", EntryPoint:="SelectObject", _
    SetLastError:=True, CharSet:=CharSet.Unicode, _
    ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
    Public Shared Function SelectObject(ByVal hDC As IntPtr, ByVal hObj As IntPtr) As IntPtr
    End Function

    <DllImport("GDI32.dll", EntryPoint:="CreateCompatibleDC", SetLastError:=True, CharSet:=CharSet.Unicode, _
    ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
    Public Shared Function CreateCompatibleDC(ByVal hRefDC As IntPtr) As IntPtr
    End Function

    <DllImport("GDI32.dll", EntryPoint:="DeleteDC", SetLastError:=True, CharSet:=CharSet.Unicode, _
    ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
    Public Shared Function DeleteDC(ByVal hDC As IntPtr) As Boolean
    End Function

    <DllImport("GDI32.dll", EntryPoint:="DeleteObject", SetLastError:=True, CharSet:=CharSet.Unicode, _
    ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
    Public Shared Function DeleteObject(ByVal hObj As IntPtr) As Boolean
    End Function

    <DllImport("User32.dll", EntryPoint:="ReleaseDC", SetLastError:=True, CharSet:=CharSet.Unicode, _
    ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
    Public Shared Function ReleaseDC(ByVal hWnd As IntPtr, ByVal hDC As IntPtr) As Boolean
    End Function

    <DllImport("User32.dll", EntryPoint:="GetDC", SetLastError:=True, CharSet:=CharSet.Unicode, _
    ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
    Public Shared Function GetDC(ByVal hWnd As IntPtr) As IntPtr
    End Function


End Class

Private Sub OnPrintPage(ByVal sender As System.Object, ByVal e As System.Drawing.Printing.PrintPageEventArgs)
        Dim hwndForm As IntPtr
        hwndForm = Me.Handle

        Dim hdcDIBSection As IntPtr
        Dim hdcRef As IntPtr
        Dim hbmDIBSection As IntPtr
        Dim hbmDIBSectionOld As IntPtr
        Dim BMPheader As Win32APICall.BITMAPINFOHEADER

        hdcRef = Win32APICall.GetDC(IntPtr.Zero)
        hdcDIBSection = Win32APICall.CreateCompatibleDC(hdcRef)
        Win32APICall.ReleaseDC(IntPtr.Zero, hdcRef)

        BMPheader.biBitCount = 24
        BMPheader.biClrImportant = 0
        BMPheader.biClrUsed = 0
        BMPheader.biCompression = Win32APICall.BI_RGB
        BMPheader.biSize = 40
        BMPheader.biHeight = 964
        BMPheader.biPlanes = 1
        BMPheader.biSizeImage = 0
        BMPheader.biWidth = Me.Width
        BMPheader.biXPelsPerMeter = 0
        BMPheader.biYPelsPerMeter = 0

        hbmDIBSection = Win32APICall.CreateDIBSection(hdcDIBSection, BMPheader, Win32APICall.DIB_RGB_COLORS, _
        IntPtr.Zero, IntPtr.Zero, 0)

        hbmDIBSectionOld = Win32APICall.SelectObject(hdcDIBSection, hbmDIBSection)
        Win32APICall.PatBlt(hdcDIBSection, 0, 0, Me.Width, 964, Win32APICall.WHITENESS)
        Win32APICall.PrintWindow(hwndForm, hdcDIBSection, 0)
        Win32APICall.SelectObject(hdcDIBSection, hbmDIBSectionOld)

        Dim imageFrm As Bitmap
        imageFrm = Image.FromHbitmap(hbmDIBSection)
        e.Graphics.DrawImage(imageFrm, 0, 0)

        Win32APICall.DeleteDC(hdcDIBSection)
        Win32APICall.DeleteObject(hbmDIBSection)
    End Sub

Imports System.Drawing.Printing
Imports System.Drawing.Graphics
Imports System.Drawing.Imaging
Imports System.Runtime.InteropServices