Push Notifications in Windows 8: Listing 1

The authorization class WnsAuthorization

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.Serialization;
using System.Net;
using System.Web;
using System.IO;
using System.Runtime.Serialization.Json;
namespace VSMWnsPushNotifier
    public class WnsAuthorization
        public class OAuthToken
            [DataMember(Name = "access_token")]
            public string AccessToken { get; set; }
            [DataMember(Name = "token_type")]
            public string TokenType { get; set; }
        public static OAuthToken GetOAuthToken(string secretKey, string sid)
            string encodedSid = HttpUtility.UrlEncode(String.Format("{0}", sid));
            string encodedSecretKey = HttpUtility.UrlEncode(secretKey);
            string message = String.Format("grant_type=client_credentials&client_id={0}&client_secret={1}
            &scope=notify.windows.com", encodedSid, encodedSecretKey);
            WebClient client = new WebClient();
            client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
            string response = client.UploadString("https://login.live.com/accesstoken.srf", message);
            OAuthToken oAuthToken;
            using (MemoryStream memStream = new MemoryStream(Encoding.Unicode.GetBytes(response)))
                DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof(OAuthToken));
                oAuthToken = (OAuthToken)jsonSerializer.ReadObject(memStream);
            return oAuthToken;

About the Author

Eric Vogel is a Sr. Software Developer at Kunz, Leigh, & Associates in Okemos, MI. He is the president of the Greater Lansing User Group for .NET. Eric enjoys learning about software architecture and craftsmanship, and is always looking for ways to create more robust and testable applications. Contact him at vogelvision@gmail.com.