Authentication Response Failed

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C#

ASP.NET

Dear Friends,

I want get information of the user from social network.
I have written a code for getting the information using OpenID.
But I am getting the message as Login Failed.

DotNetOpenAuth.OpenId.RelyingParty.FailedAuthenticationResponse

Code:

using DotNetOpenAuth.OpenId;
using DotNetOpenAuth.OpenId.RelyingParty;
using System;
using System.Collections.Generic;
using System.Web.UI.WebControls;
using System.Text;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        OpenIdRelyingParty rp = new OpenIdRelyingParty();
        var response = rp.GetResponse();
        var st = "";
        var msg = "";
        if (response != null)
        {
            switch (response.Status)
            {
                case AuthenticationStatus.Authenticated:
                    Session["GoogleIdentifier"] = response.ClaimedIdentifier.ToString();
                    st= response.ClaimedIdentifier.ToString();
                    msg = response.ToString();
                    Response.Redirect("Default.aspx");
                    break;
                case AuthenticationStatus.Canceled:
                    Session["GoogleIdentifier"] = "Cancelled.";
                    st = "Cancelled.";
                    msg = response.ToString();
                    break;
                case AuthenticationStatus.Failed:
                    Session["GoogleIdentifier"] = "Login Failed.";
                    st = "Login Failed.";
                    msg = response.ToString();
                    break;
            }
        }
        if (st!= "")
        {
            Label1.Text = st;
            Label2.Text = msg;
        }
    }
    //Onclick of Icon
    protected void btnGL_Click(object sender, CommandEventArgs e)
    {
        string GLUri = e.CommandArgument.ToString();
        OpenIdRelyingParty oid = new OpenIdRelyingParty();
        var Uribuilder = new UriBuilder(Request.Url) { Query = "" };
        var request = oid.CreateRequest(GLUri, Uribuilder.Uri, Uribuilder.Uri);
        request.RedirectToProvider();
    }   
}

Kindly suggest and give solution for the same.
Thanks.