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研究很久的翻譯API總算有了結果

        public class AdmAccessToken
        {
            public string access_token { get; set; }
            public string token_type { get; set; }
            public string expires_in { get; set; }
            public string scope { get; set; }
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            Button1.Click += new EventHandler(Button1_Click);
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            //throw new NotImplementedException();

            string clientID = "<APPID>";
            string clientSecret = "<clientSecret >";  //以上兩條請去Bing 申請APPID
            String strTranslatorAccessURI = "https://datamarket.accesscontrol.windows.net/v2/OAuth2-13";
            String strRequestDetails = string.Format("grant_type=client_credentials&client_id={0}&client_secret={1}&scope=http://api.microsofttranslator.com", HttpUtility.UrlEncode(clientID), HttpUtility.UrlEncode(clientSecret));
            System.Net.WebRequest webRequest = System.Net.WebRequest.Create(strTranslatorAccessURI);
            webRequest.ContentType = "application/x-www-form-urlencoded";
            webRequest.Method = "POST";

            byte[] bytes = System.Text.Encoding.ASCII.GetBytes(strRequestDetails);
            webRequest.ContentLength = bytes.Length;
            using (System.IO.Stream outputStream = webRequest.GetRequestStream())
            {
                outputStream.Write(bytes, 0, bytes.Length);
            }

            System.Net.WebResponse webResponse = webRequest.GetResponse();
            DataContractJsonSerializer serializer = new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(AdmAccessToken));

            AdmAccessToken token = (AdmAccessToken)serializer.ReadObject(webResponse.GetResponseStream());
            string headerValue = "Bearer " + token.access_token;

            string txtToTranslate = TextBox1.Text;
            string uri = "http://api.microsofttranslator.com/v2/Http.svc/Translate?text=" + System.Web.HttpUtility.UrlEncode(txtToTranslate) + "&from=en&to=es";
            System.Net.WebRequest translationWebRequest = System.Net.WebRequest.Create(uri);
            translationWebRequest.Headers.Add("Authorization", headerValue);
            System.Net.WebResponse response = null;
            response = translationWebRequest.GetResponse();
            System.IO.Stream stream = response.GetResponseStream();
            System.Text.Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
            System.IO.StreamReader translatedStream = new System.IO.StreamReader(stream, encode);
            System.Xml.XmlDocument xTranslation = new System.Xml.XmlDocument();
            xTranslation.LoadXml(translatedStream.ReadToEnd());
            lbl1.Text = xTranslation.InnerText;  // 輸出到lbl1.Text
        }

參考資料: http://blogs.msdn.com/b/translation/p/gettingstarted2.aspx