Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted

If WebBrowser1.Url.ToString() = "https://ebildirge.sgk.gov.tr/WPEB/amp/gecBildGoruntule" Then
            ComboBox4.Enabled = True

               If WebBrowser1.IsBusy <> True Then
                ComboBox4.Items.Clear()
                dokuman = WebBrowser1.Document.DomDocument
                dokumanElementleri = dokuman.getElementsByTagName("form")
                For Each i As mshtml.IHTMLElement In dokumanElementleri
                    If i.id <> "logoutform" Then
                        ComboBox4.Items.Add(i.id)

                    End If
                Next
            End If
 End Sub

Private Sub goster()
        On Error Resume Next
        Application.DoEvents()
        Me.WebBrowser1.Navigate("https://ebildirge.sgk.gov.tr/WPEB/jsp/anamenu_ap.jsp")
End Sub

Dim frmIsim As String
    Private Sub AdreseGit()
        On Error Resume Next
        Do While WebBrowser1.Url.ToString().Trim() <> "https://ebildirge.sgk.gov.tr/WPEB/amp/gecBildGoruntule"
            Application.DoEvents()
            If WebBrowser1.Url.ToString().Trim() <> "https://ebildirge.sgk.gov.tr/WPEB/amp/gecBildGoruntule" Then
                Continue Do
            End If
        Loop

        If WebBrowser1.Url.ToString() = "https://ebildirge.sgk.gov.tr/WPEB/amp/gecBildGoruntule" Then
            WebBrowser1.Navigate("javascript:" + frmIsim + ".action='/WPEB/TahakkukFisi.pdf?rapor=TahakkukFisi&n=0';        " + frmIsim + ".submit();")
        End If
    End Sub

Private Sub ComboBox4_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox4.SelectedIndexChanged
        goster()
        AdreseGit()
        frmIsim = ""
        frmIsim = ComboBox4.SelectedItem.ToString().Trim()
        If WebBrowser1.Url.ToString() = "https://ebildirge.sgk.gov.tr/WPEB/amp/gecBildGoruntule" And WebBrowser1.IsBusy = False Then
            WebBrowser1.Navigate("javascript:" + frmIsim + ".action='/WPEB/TahakkukFisi.pdf?rapor=TahakkukFisi&n=0';        " + frmIsim + ".submit();")
        ElseIf WebBrowser1.Url.ToString() = "https://ebildirge.sgk.gov.tr/WPEB/TahakkukFisi.pdf?rapor=TahakkukFisi&n=0" Then
            goster()
            AdreseGit()
        End If
End Sub