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copied!<p>OK, I've sorted it out - but I'm not sure why. I have a feeling that the Facebook C# SDK screws around with the signed request in some way. If I get the signed request using Request.Forms["signed_request"] it all seems to work.</p> <p>I'll share my working code in the hope that it will help others with the same problem.</p> <pre><code> //Pull in the facebook app settings from the web.config file var settings = ConfigurationManager.GetSection("facebookSettings"); var current = settings as IFacebookApplication; //Set up some stuff for later string currentFacebookPageID = current.AppId; bool currentFacebookPageLiked = false; //Get the signed request FacebookSignedRequest SignedRequest = FacebookSignedRequest.Parse(current, Request.Form["signed_request"]); dynamic SignedRequestData = SignedRequest.Data; //extract what we need from the request var RawRequestData = (IDictionary<string, object>)SignedRequestData; //Check to see if we've got the data we need if (RawRequestData.ContainsKey("page") == true) { //We do, lets examine it and set the boolean as appropriate Facebook.JsonObject RawPageData = (Facebook.JsonObject)RawRequestData["page"]; if (RawPageData.ContainsKey("id") == true) currentFacebookPageID = (string)RawPageData["id"]; if (RawPageData.ContainsKey("liked") == true) currentFacebookPageLiked = (bool)RawPageData["liked"]; } if (currentFacebookPageLiked) { //Do some stuff for fans lblName.Text = "Hi " + result.first_name + " - You are a fan"; } else { //Do some stuff for non-fans lblName.Text = "Hi " + result.first_name + " - please click the like button"; } </code></pre>

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