Getting error while callback from twitter in asp.net MVC?

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ASP.NET

twitter

MVC4

i have successfully logged in at twitter but after callback it will give me 401 unauthorized error . i have already set callbackurl in twitter application.i have used DotnetOpenAuth for this implemetation. My code:` var accessToken = response.AccessToken; var userId = response.ExtraData["user_id"]; var userName = response.ExtraData["screen_name"];

var profileRequestUrl = new Uri("https://api.twitter.com/1.1/users/show.json?user_id=" + EscapeUriDataStringRfc3986(userId));
var profileEndpoint = new MessageReceivingEndpoint(profileRequestUrl, HttpDeliveryMethods.GetRequest);
var request = WebWorker.PrepareAuthorizedRequest(profileEndpoint, accessToken);

var extraData = new Dictionary<string,> { { "accesstoken", accessToken } };

try
{
using (var profileResponse = request.GetResponse())
{
using (var responseStream = profileResponse.GetResponseStream())
{
var document = xLoadXDocumentFromStream(responseStream);

AddDataIfNotEmpty(extraData, document, "name");
AddDataIfNotEmpty(extraData, document, "location");
AddDataIfNotEmpty(extraData, document, "description");
AddDataIfNotEmpty(extraData, document, "url");
}
}
}
catch
{
// At this point, the authentication is already successful. Here we are just trying to get additional data if we can. If it fails, no problem.
}`

at this point i get error=var profileResponcse=request.getResponce()

i googled but didnt found any solution for this, if any know help me.