Sign in with gmail is not working

<asp:Button ID="btnLoginToGoogle" runat="server" OnCommand="OpenLogin_Click" ToolTip="Google_Login"
                                                        CssClass="ch_google_button" CommandArgument="https://www.google.com/accounts/o8/id"
                                                        Width="141px" />

protected void OpenLogin_Click(object src, CommandEventArgs e)
    {
        try
        {
            string discoveryUri = e.CommandArgument.ToString();
            var b = new UriBuilder(Request.Url) { Query = "" };
            var req = openid.CreateRequest(discoveryUri, b.Uri, b.Uri);
            var fetchRequest = new FetchRequest();
            fetchRequest.Attributes.AddRequired(WellKnownAttributes.Contact.Email);
            fetchRequest.Attributes.AddRequired(WellKnownAttributes.Name.First);
            fetchRequest.Attributes.AddRequired(WellKnownAttributes.Name.Last);
            fetchRequest.Attributes.AddRequired(WellKnownAttributes.Person.Gender);
            fetchRequest.Attributes.AddRequired(WellKnownAttributes.Contact.Phone.Mobile);
            fetchRequest.Attributes.AddRequired(WellKnownAttributes.BirthDate.WholeBirthDate);
            req.AddExtension(fetchRequest);
            req.RedirectToProvider();
        }
        catch (Exception ex) { }
    }

((System.Threading.ThreadAbortException)(ex)) {Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.}

ex.Data Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.

ex.HelpLink Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.

ex.HResult Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.

ex.InnerException Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.

ex.Message Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.

ex.Source Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.

ex.StackTrace Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.

ex.TargetSite Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.