[VB.NET] تعديل على مشروع بسييط مساعدتكم

PHP كود :
 Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Button1.Enabled = False
        Dim awaiter = Task.Run(Of String)(New Func(Of String)(Function() getWiki(TextBox1.Text))).GetAwaiter()
        While Not awaiter.IsCompleted
            Application.DoEvents()
            Dim awaiterResult As String = awaiter.GetResult()
            RichTextBox1.Text = If(String.IsNullOrWhiteSpace(awaiterResult), "لا توجد نتائج لما تبحث عنه", awaiterResult)
            Button1.Enabled = True
        End While


    End Sub

    Private Function getWiki(ByVal Q As String) As String
        lock.EnterReadLock()
        Try
            Dim req As HttpWebRequest = WebRequest.Create("https://www.google.com.kw/search?q=" & Q)
            req.Method = "GET"
            req.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0"
            req.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
            req.CookieContainer = New CookieContainer
            Using res = req.GetResponse()
                Using resStrm = res.GetResponseStream()
                    Using rdr = New StreamReader(resStrm)
                        Dim ResponseString As String = rdr.ReadToEnd().Replace(Chr(10), " ")
                        Dim PictureM As Match = Regex.Matches(ResponseString, "_image_src='data:image/(.+?);base64,(.+?)'", RegexOptions.IgnoreCase)(0)
                        File.WriteAllText(".\abc.txt", PictureM.Value)
                        Dim bytes() As Byte = Convert.FromBase64String(PictureM.Groups(2).Value)
                        If Not Directory.Exists(".\pictures\") Then Directory.CreateDirectory(".\pictures\")
                        File.WriteAllBytes(".\pictures\mm." & PictureM.Groups(1).Value, bytes)
                        PictureBox1.Image = Image.FromFile(".\pictures\mm." & PictureM.Groups(1).Value)
                        Return Regex.Match(ResponseString, ";""><span>(.+?)</span>.+?fl q _KCd _tWc", RegexOptions.IgnoreCase).Groups(1).Value
                    End Using
                End Using
            End Using
        Catch ex As WebException
            Return "An error occured." & vbNewLine & ex.Message
        Finally
            lock.ExitReadLock()
        End Try
    End Function