У меня есть код, который получает ответ от запроса POST:

//Запрос авторизации бухаря
        WebRequest request = WebRequest.Create("http://clannr.org/scripts/login/auth.php");
        request.Method = "POST";
        string postData = "user=" + Login.Text + "&password=" + Password.Text + "&version=13";
        byte[] byteArray = Encoding.UTF8.GetBytes(postData);
        request.ContentType = "application/x-www-form-urlencoded";
        request.ContentLength = byteArray.Length;
        Stream dataStream = request.GetRequestStream();
        dataStream.Write(byteArray, 0, byteArray.Length);
        dataStream.Close();
        WebResponse response = request.GetResponse();
        Console.WriteLine(((HttpWebResponse)response).StatusDescription);
        dataStream = response.GetResponseStream();
        StreamReader reader = new StreamReader(dataStream);
        string responseFromServer = reader.ReadToEnd();
        reader.Close();
        dataStream.Close();
        response.Close();

Но при проверке ответа:

        Match match = regex.Match(responseFromServer);

if (match.Success)
        {
            var input = responseFromServer;
            var split = input.Split(':');
            var final = split[3];
            ProcessStartInfo mcStartInfo = new ProcessStartInfo("javaw", "-Xms1024m -Xmx1024m -cp \"" + appData + "\\.ClanNR\\bin\\minecraft1.jar;" + appData + "\\.ClanNR\\bin\\jinput.jar;" + appData + "\\.ClanNR\\bin\\lwjgl.jar;" + appData + "\\.ClanNR\\bin\\lwjgl_util.jar \" -Djava.library.path=\"" + appData + "\\.ClanNR\\bin\\natives\" net.minecraft.client.Minecraft" + " " + username + " " + final + " " + server1);
            Process.Start(mcStartInfo);
            this.Close();



        }

        else if (responseFromServer == " Bad Login")
        {
            MessageBox.Show("Uncorrect login/password!");
        }
        else if (responseFromServer == " Old version")
        {
            MessageBox.Show("Launcher is old!");
        }

Мой код вызывал только 2 функции, т.е. показывал 2 MessageBox

Как это исправить?

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