Retrieve user data from gmail and yahoo login

See more:

C#

ASP.NET

Hello,

In want to retrieve user data to SignIn through Gmail or Yahoo id.
I am designing such a web application in which it has no own user registration.
User can use there existing Gmail or Yahoo id to SignIn in the web application.
I have required OAuth Consumer Key and OAuth Consumer Secret for both application.
I want C# code for user login through Gmail and Yahoo and retrieve login information of user like username , firstname and lastname.


I have used this code for login with google
add these namespace

using DotNetOpenAuth.OpenId;
using DotNetOpenAuth.OpenId.RelyingParty;


      protected void Page_Load(object sender, EventArgs e)
       {
          if (!IsPostBack)
        {
            OpenIdRelyingParty rp = new OpenIdRelyingParty();
            var r = rp.GetResponse();
            if (r != null)
            {
                switch (r.Status)
                {
                    case AuthenticationStatus.Authenticated:
                       // NotLoggedIn.Visible = false;
                        Session["GoogleIdentifier"] = r.ClaimedIdentifier.ToString();
                        //AttributeValues att = new AttributeValues();
                        //Response.Write(Session["GoogleIdentifier"]);

                        //Response.Redirect("Main.aspx"); //redirect to main page of your website
                        break;
                    case AuthenticationStatus.Canceled:
                        //lblAlertMsg.Text = "Cancelled.";
                        break;
                    case AuthenticationStatus.Failed:
                        //lblAlertMsg.Text = "Login Failed.";
                        break;
                }
            }
         }
     }

protected void imgbtnGoogle_Click(object sender, ImageClickEventArgs e)
    {
        string discoveryUri = "https://www.google.com/accounts/o8/id";
        OpenIdRelyingParty openid = new OpenIdRelyingParty();
        var b = new UriBuilder(Request.Url) { Query = "" };
        var req = openid.CreateRequest(discoveryUri, b.Uri, b.Uri);
        req.RedirectToProvider();
    }

This code helped me in Login with the Google.

But Now the problem is how to retrieve login information of user like username , firstname and lastname.

With Warm Regards,
Deepak Pandey