to allow cross site service call for web api

allow cors.xml

<system.webServer>
    <httpProtocol>
        <customHeaders>
            <!-- Adding the following custom HttpHeader will help prevent CORS from stopping the Request-->
            <add name="Access-Control-Allow-Origin" value="*" />
        </customHeaders>
    </httpProtocol>
</system.webServer>

post request from server

  public StringResult fdfriendstestservice()
        {
            //WebClient wc = new WebClient();

            //string NoochAppAccessToken = Utility.GetValueFromConfig("NoochFBAppAccessToken");// CAAC0VZAIiwsEBAEceki7EWz7UryKqsrtZC9cP0KDptv9MlZCCHdL0rU6nXpYJGfL6XoCDRYntjGN1NEiNypIYyeZBBkPlSiFwUeTZBXDqRXU1wiF5ggqrHLUxPANyAz8RGqZCkZAwxa3f4eqjjuL0EipDeOjxNQatTWU94inMjYkNwwOxomyYZBy8KoZCYxNYtGyiyeZBWT6ucTnbcFLBVEG7K

            //string urlString = "https://graph.facebook.com/v2.2/" + "1212400310" +
            //                   "/friends/?key=value&access_token=" + NoochAppAccessToken;
            //string fbGraphResultString = wc.DownloadString(urlString);
            //FBResponseClass fbGraphResults = JsonConvert.DeserializeObject<FBResponseClass>(fbGraphResultString);


            // to test google url shortner
            string longurltpshorten = "https://developers.google.com/url-shortener/v1/getting_started#shorten";
            var cli = new WebClient();
            cli.Headers[HttpRequestHeader.ContentType] = "application/json";
            string response = cli.UploadString("https://www.googleapis.com/urlshortener/v1/url", "{longUrl:\""+longurltpshorten+"\"}");
            googleURLShortnerResponseClass fbGraphResults = JsonConvert.DeserializeObject<googleURLShortnerResponseClass>(response);



            return new StringResult { Result = "sd"};
        }

usefull links

To upload file
http://davidsonsousa.net/en/post/how-to-upload-a-file-using-mvc-3-and-ajax


to begin with angular js and phonegap
http://tech.pro/tutorial/1336/phonegap-and-angularjs-the-start