Asp.Net MVC3 Razor with facebook Authentication

Today we have to see Asp.Net MVC3 Razor with facebook Authentication before we see details first u have to Register u r Application in facebook developer(https://developers.facebook.com/apps).and u got AppID.

Ok now lets see step by step

Step 1 :Open VS 2010 go to project and select Asp.Net MVC 3 Web Application

Step 2 :select empty and select Razor

Step 3 :Now go to Controllers and right click and give Some name like Home Controllers and add this code

public ActionResult Index()
{
if (!string.IsNullOrEmpty(Request.Params["signed_request"]))
{
ViewBag.IsAuthenticated =true;
Dictionary<string,string> info = Utility.DecodePayload(Request.Params["signed_request"]);
Session["access_token"] = info;
Facebook.FacebookAPI api = new Facebook.FacebookAPI(info["oauth_token"]);
var json = api.Get("/me");
}
else
ViewBag.IsAuthenticated = false;
return View();
}

Step 4 :Now go to Model and

create utility class(Here u have to Add Facebook API throw reference in our App)

public class Utility
{
public static Dictionary<string, string> DecodePayload(string payload)
{
var parameters = new Dictionary<string, string>();

try
{
string[] sB64String = payload.Split('.');
payload = payload.Replace((sB64String[0] + "."), string.Empty);
//End
var encoding = new UTF8Encoding();
var decodedJson = payload.Replace("=", string.Empty).Replace('-', '+').Replace('_', '/');
var base64JsonArray = Convert.FromBase64String(decodedJson.PadRight(decodedJson.Length + (4 -
decodedJson.Length % 4) % 4, '='))

var json = encoding.GetString(base64JsonArray);

var jObject = JSONObject.CreateFromString(json);
//parameters.Add("liked", jObject.Dictionary["page"].Dictionary["liked"].Boolean.ToString());
{
parameters.Add("isAuthorized", "true");
parameters.Add("oauth_token", jObject.Dictionary["oauth_token"].String);
parameters.Add("profile_id", jObject.Dictionary["user_id"].String);
}
else
{
parameters.Add("isAuthorized", "false");
parameters.Add("oauth_token", string.Empty);
}

}
catch { }

return parameters;
}
}

Step 5 :now go to Home Controllers and right click on Index and add View after adding u have to write this code

index.chtml code is