Wenn du einfach eine Seite mit POST Parametern aufrufen willst, dann beschäftige dich mal mit HTTPWebRequests.
Hier ein Snippet für dich, den du anpassen kannst.
	Code:
	Private Cookie As CookieContainer = Nothing
   Private Function WebReq(ByVal URL As String, ByVal Post As String) As String
        Dim Request As HttpWebRequest = CType(WebRequest.Create(URL), HttpWebRequest)
        Request.CookieContainer = Cookie
        Request.Method = "POST"
        Request.ContentType = "application/x-www-form-urlencoded"
        Request.Timeout = 12000
        Dim byteArray() As Byte = Encoding.UTF8.GetBytes(Post)
        Request.ContentLength = byteArray.Length
        Dim DataStream As Stream = Request.GetRequestStream()
        DataStream.Write(byteArray, 0, byteArray.Length)
        DataStream.Close()
        Dim Response As HttpWebResponse = Request.GetResponse()
        DataStream = Response.GetResponseStream()
        Dim reader As New StreamReader(DataStream, System.Text.Encoding.UTF8)
        Dim ServerResponse As String = reader.ReadToEnd()
        reader.Close()
        DataStream.Close()
        Response.Close()
        Return ServerResponse
    End Function
 Bevor ichs vergesse: Verwendete Namespaces: System.IO, System.Net, System.Text