Question

I am a newbie at ASP.net programming. This is in reference to the Facebook C# SDK, I have managed to set up all the steps required for authentication on this SDK. However, I keep getting a null from the following code:

(reference: http://csharpsdk.org/docs/web/getting-started#5)

var accessToken = Session["AccessToken"].ToString(); //This line returns null and crashes
var client = new FacebookClient(accessToken);
dynamic result = client.Get("me", new { fields = "name,id" });
string name = result.name;
string id = result.id;

Just like in the example, I had set up a generic handler to set up the session variable to be stored in the HttpContext.Session object.

I even tried to modify the offending line to directly access the HttpContext and retrieve the access token:

var accessToken = HttpContext.Current.Session["AccessToken"].ToString();

but this yielded the same result.

Have I missed out something in the webconfig or is there some other way I can store the access token when shifting from the handler to the log in page?

Answer 1

If it is returning null then I would assume that the Session value is not being set – have you debugged to make sure the code which sets the session is being hit?

Looking at the linked article – it uses a HttpHandler to do this bit but does not mention anything about registering it in the Web.Config – have you done this? If not see here http://msdn.microsoft.com/en-us/library/46c5ddfy.aspx