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    <p>Not sure if you came right ... but I referenced the Facebook C# SDK and did this:</p> <p>Deauth.aspx:</p> <pre><code>protected void Page_Load(object sender, EventArgs e) { if (!String.IsNullOrEmpty(Request["signed_request"])) { string signed_request = Request["signed_request"]; Dictionary&lt;string, Facebook.JSONObject&gt; jsonDict = new Dictionary&lt;string, Facebook.JSONObject&gt;(); if (Helper.FacebookAPI.ValidateSignedRequest(signed_request, out jsonDict)) { if (jsonDict.ContainsKey("user_id")) { long FacebookId = jsonDict["user_id"].Integer; // delete code } } } } </code></pre> <p>Then my Facebook Helper class looks like this:</p> <pre><code>namespace Helper { public static class FacebookAPI { public static Dictionary&lt;string, Facebook.JSONObject&gt; DecodePayload(string payload) { 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 = Facebook.JSONObject.CreateFromString(json); return jObject.Dictionary; } public static bool ValidateSignedRequest(string VALID_SIGNED_REQUEST, out Dictionary&lt;string, Facebook.JSONObject&gt; json) { string applicationSecret = ConfigurationManager.AppSettings["Secret"]; string[] signedRequest = VALID_SIGNED_REQUEST.Split('.'); string expectedSignature = signedRequest[0]; string payload = signedRequest[1]; json = DecodePayload(payload); // Attempt to get same hash var Hmac = SignWithHmac(UTF8Encoding.UTF8.GetBytes(payload), UTF8Encoding.UTF8.GetBytes(applicationSecret)); var HmacBase64 = ToUrlBase64String(Hmac); return (HmacBase64 == expectedSignature); } private static string ToUrlBase64String(byte[] Input) { return Convert.ToBase64String(Input).Replace("=", String.Empty) .Replace('+', '-') .Replace('/', '_'); } private static byte[] SignWithHmac(byte[] dataToSign, byte[] keyBody) { using (var hmacAlgorithm = new HMACSHA256(keyBody)) { hmacAlgorithm.ComputeHash(dataToSign); return hmacAlgorithm.Hash; } } public static string SerializeDict(Dictionary&lt;string, Facebook.JSONObject&gt; jsonDict) { // serialize the dictionary DataContractSerializer serializer = new DataContractSerializer(jsonDict.GetType()); using (StringWriter sw = new StringWriter()) { using (XmlTextWriter writer = new XmlTextWriter(sw)) { // add formatting so the XML is easy to read in the log writer.Formatting = Formatting.Indented; serializer.WriteObject(writer, jsonDict); writer.Flush(); return sw.ToString(); } } } public static string GetAuthToken() { string appId = ConfigurationManager.AppSettings["AppId"]; string secret = ConfigurationManager.AppSettings["Secret"]; string url = String.Format("https://graph.facebook.com/oauth/access_token?client_id={0}&amp;client_secret={1}&amp;grant_type=client_credentials", appId, secret); string[] token = HttpGetData(url).Split('='); return token[1]; } public static string HttpGetData(string url) { HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest; using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) { StreamReader reader = new StreamReader(response.GetResponseStream()); return (reader.ReadToEnd()); } } public static string HttpPostData(string url, string nameValuePair) { HttpWebRequest request = WebRequest.Create(url + "&amp;" + nameValuePair) as HttpWebRequest; request.Method = WebRequestMethods.Http.Post; try { using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) { StreamReader reader = new StreamReader(response.GetResponseStream()); return (reader.ReadToEnd()); } } catch (WebException ex) { return ex.Message; } } }} </code></pre>
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