Help with powerClick Login

[Xizilion 0]

So im trying to do a login on Powerclick by a C# webbrowser and when i pressed the login button (manually) it just refresh the page instead of login

using System;using System.Drawing;using System.Windows.Forms;using System.Net;using System.IO;namespace ClickTest{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            Browser.ScriptErrorsSuppressed = true;            Browser.Navigate(textBox1.Text, "_self", null, "User-Agent: User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0");        }    private void Browser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)        {            var elements = Browser.Document.GetElementsByTagName("input");            elements[1].SetAttribute("Value","User");            elements[2].SetAttribute("Value", "Password");            var captchaimage = Browser.Document.GetElementsByTagName("img");            listBox1.Items.Add(captchaimage[0].GetAttribute("src"));            WebClient wc = new WebClient();            byte[] bytes = wc.DownloadData(captchaimage[0].GetAttribute("src"));            Bitmap image = new Bitmap(new MemoryStream(bytes));                             }    }}

Can any1 see any problem with the code or can help me with the code