How to translate from English to other language(Malay)?

Hi,
I am using the code as suggested here:<a href="http://blogs.msdn.com/b/shahpiyush/archive/2007/06/09/3188246.aspx"></a>
Please find my code below:
I have two text boxes,and in text_change event of one text box I am calling the method which will convert the text entered in English in the first text box into the second text box in some other language.
<pre>
protected void txtEnglish_TextChanged(object sender, EventArgs e)
{
// txtMalay.Text = txtEnglish.Text;
// "ar|en"
string langpair="en|ar";
txtMalay.Text = TranslateText(txtEnglish.Text,langpair);
}
public string TranslateText(string input,string languagePair)
{
try
{
// string url = String.Format("http://www.google.com/translate_t?hl=en&ie=UTF8&text={0}&langpair={1}", input, languagePair);
string url = String.Format("http://www.google.com/translate_t?hl=en&ie=UTF8&text={0}&langpair={1}", input, languagePair);
WebClient webClient = new WebClient();
//WebClient wc = new WebClient();
webClient.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(Encoding.ASCII.GetBytes("user:pass")));
// string a = ws.DownloadString("http://www.example.com");

webClient.Encoding = System.Text.Encoding.UTF8;
NetworkCredential netcredit = new NetworkCredential("archowdhury", "Secure*45", "corp");
webClient.Credentials = netcredit;
webClient.Proxy = new System.Net.WebProxy()
{
Credentials = new System.Net.NetworkCredential("archowdhury", "Secure*45", "corp")
};


string result = webClient.DownloadString(url);

result = result.Substring(result.IndexOf("id=result_box") + 22, result.IndexOf("id=result_box") + 500);

result = result.Substring(0, result.IndexOf("</div"));

return result;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
return ("failure");
}
</pre>
I am getting the following exception:"UNABLE TO CONNECT TO THE REMOTE SERVER! "
Whats wrong here?