Example Pastebin

private void Get_EANInfo(string Str_EAN, string Str_ID)
{
    string Str_LMWURL = ("http://opengtindb.org/?ean=" + Str_EAN + "&cmd=query&queryid=" + Str_ID);
    this.label1.Text = Str_LMWURL; // URL als ganzes
    WebRequest WebRequest_Request = WebRequest.Create(Str_LMWURL);
    WebRequest_Request.Credentials = CredentialCache.DefaultCredentials;
    HttpWebResponse HttpWebResponse_Response = (HttpWebResponse)WebRequest_Request.GetResponse();
    // Ausgabe
    this.richTextBox1.AppendText(HttpWebResponse_Response.StatusDescription + "\r"); //RichtextBox
    // Stream
    Stream Stream_DataStream = HttpWebResponse_Response.GetResponseStream();
    StreamReader StreamReade_Reader = new StreamReader(Stream_DataStream);
    // Read data
    string Str_ResponseFromServer = StreamReade_Reader.ReadToEnd();
    this.richTextBox1.AppendText(Str_ResponseFromServer + "\r"); //RichtextBox

    // Close
    StreamReade_Reader.Close();
    Stream_DataStream.Close();
    HttpWebResponse_Response.Close();
}