Отправляйте разговоры на форумы с помощью приложения C#

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Я хочу отправить разговор на форум веб-сайта на c#.

Что я уже пробовал:

// Create a request and pass the URL to receive the post.
           WebRequest request = WebRequest.Create(uri);
           // We set the Method property of the request to POST.
           request.Method = "POST";
           // We create what is being sent by the POST method and convert it to byte array.
           string postData = "my text message";
           byte[] byteArray = Encoding.UTF8.GetBytes(postData);
           // We set the ContentType of the WebRequest to xml.
           request.ContentType = "text/xml";
           // We set the ContentLength of the WebRequest.
           request.ContentLength = byteArray.Length;
           // We get the request stream.
           Stream dataStream = request.GetRequestStream();
           // write the data to the request stream.
           dataStream.Write(byteArray, 0, byteArray.Length);
           // create the Stream object.
           dataStream.Close();

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