Problem tWith Yahoo Login with open authentication

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ASP.NET

C#3.5

Hello,

I am using this code to for request token to use Sign in With yahoo using Oenid
this code is showing errorerror "oauth_problem=consumer_key_rejected"

what is wrong with code and what will be the correct code

private void MakeRequestForToken()
   {
       string consumerKey =ConfigurationManager.AppSettings["YahooConsumerKey"];
       string consumerSecret =ConfigurationManager.AppSettings["YahooConsumerSecret"];

       string requestTokenEndpoint = "https://api.login.yahoo.com/oauth/v2/get_request_token";
       string requestTokenCallback = GetRouteableUrlFromRelativeUrl("YahooValidation.aspx/authorizeToken/yahoo/");
       string authorizeTokenUrl = "https://api.login.yahoo.com/oauth/v2/request_auth";

       // Step 1: Make the call to request a token
       var oAuthConsumer = new OAuthConsumerNew();
       var requestToken = oAuthConsumer.GetOAuthRequestToken(requestTokenEndpoint, realm, consumerKey, consumerSecret, requestTokenCallback);
       PersistRequestToken(requestToken);


       // Step 2: Make a the call to authorize the request token
       Response.Redirect(authorizeTokenUrl + "?oauth_token=" + requestToken.Token);
   }

private void HandleAuthorizeTokenResponse()
    {
        string consumerKey =ConfigurationManager.AppSettings["YahooConsumerKey"];
        //string consumerSecret =ConfigurationManager.AppSettings["YahooConsumerSecret"];

        string token = Request.QueryString["oauth_token"];
        string verifier = Request.QueryString["oauth_verifier"];
        string accessTokenEndpoint = "https://api.login.yahoo.com/oauth/v2/request_auth";

        // Exchange the Request Token for an Access Token
        var oAuthConsumer = new OAuthConsumerNew();

        var accessToken = oAuthConsumer.GetOAuthAccessToken(accessTokenEndpoint, realm, consumerKey, consumerSecret, token, verifier, GetRequesttoken().TokenSecret);


        var responseText = oAuthConsumer.GetUserInfo("https://www.yahoo.com/userinfo/email", realm, consumerKey, consumerSecret, accessToken.Token, accessToken.TokenSecret);

        string queryString = responseText;
        NameValueCollection nvc = StringToNameValueCollection(responseText);

        if (nvc["email"] != "")
        {
            string userName = "";
            //string password = "";
            userName = nvc["email"].ToString();
        }
    }

and what will be the string accessTokenEndpoint = "https://api.login.yahoo.com/oauth/v2/request_auth";

Is this accessTokenEndpoint retrive user information like userid,firstname and lastname
or if this will not return this value then what should use to get resired result form yahoo login

Thanks,
Deepak