pourquoi ai-je une exception stack overflow ?

Bonjour,

j'ai fait une petite application pour d'abord me connecter avec mon login et password sur un site et ensuite avec le httpwebrequest, downloader chaque fichier qui commencent tous par le même nom mais avec un id différent, voilà pourquoi j'ai fait une boucle.

par contre après environ 200 fichiers, j'ai toujours une exception stack overflow sur le request.getresponse. Quelqu'un aurait-il une idée pourquoi ?

Voici mon code:

Code:

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Public Class Form1
 
    Dim ix As Int32
    Dim urlString As String
 
    Dim filename As String
    Dim destinationFile As String
    Dim readStream As BinaryReader
    Dim ByteBucket() As [Byte]
 
 
 
    Private Sub grab()
 
        urlString = "http://www.site.com/script.php?id=" & CStr(ix)
 
        Try
 
            Dim request As HttpWebRequest = HttpWebRequest.Create(urlString)
 
 
            request.CookieContainer = GetCookieContainer()
 
 
            Using response As HttpWebResponse = request.GetResponse
 
                filename = response.Headers(7).ToString
 
                Do Until filename.Length > 3
                    System.Threading.Thread.Sleep(500)
                Loop
 
                If filename.Substring(0, 9) = "filename=" And filename.Length > 12 Then
 
                    destinationFile = txtSaveFolder.Text.ToString & Split(filename, "=")(1)
 
                    Using readStream As New BinaryReader(response.GetResponseStream())
 
                        Using fileToWrite As FileStream = New FileStream(destinationFile, FileMode.Create, FileAccess.Write)
 
                            Dim Buffer(4096) As Byte, BlockSize As Integer
 
                            'Memory stream to store data   
                            Using TempStream As New MemoryStream
 
                                Do
                                    BlockSize = readStream.Read(Buffer, 0, 4096)
                                    If BlockSize > 0 Then TempStream.Write(Buffer, 0, BlockSize)
 
                                Loop While BlockSize > 0
 
                                ByteBucket = TempStream.ToArray
                                fileToWrite.Write(ByteBucket, 0, ByteBucket.Length)
 
                            End Using
 
                        End Using
 
                    End Using
 
                End If
 
                response.Close()
 
 
 
            End Using
 
 
        Catch ex As Exception
 
            MsgBox(ex.Message)
 
        End Try
 
        Call GC.Collect()
 
        System.Threading.Thread.Sleep(2000)
 
        If ix < CInt(txtEnd.Text) Then
            ix += 1
            Call grab()
        End If
 
 
 
    End Sub
 
    Public Function GetCookieContainer() As CookieContainer
 
        Dim container As New CookieContainer()
 
        For Each cookie As String In webBrowser1.Document.Cookie.Split(";"c)
 
            Dim name As String = cookie.Split("="c)(0)
            Dim value As String = cookie.Substring(name.Length + 1)
            Dim path As String = "/"
            Dim domain As String = ".site.com"
 
            container.Add(New Cookie(name.Trim(), value.Trim(), path, domain))
        Next
 
        Return container
 
    End Function
 
 
 
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
 
        ix = CInt(txtStart.Text)
 
        Call grab()
 
 
    End Sub
 
End Class