openid example

 var openid_identifier = ConfigurationManager.AppSettings["openid_identifier"];
            var returnUrl = "OpenIdHandler.aspx";
            var response = openid.GetResponse();
            if (response == null)
            {
                // Stage 2: user submitting Identifier
                Identifier id;
                if (Identifier.TryParse(openid_identifier, out id))
                {
                    try
                    {
                        IAuthenticationRequest request = openid.CreateRequest(openid_identifier);
                        FetchRequest fetch = new FetchRequest();
                        fetch.Attributes.Add(new AttributeRequest(WellKnownAttributes.Contact.Email));
                        fetch.Attributes.Add(new AttributeRequest(WellKnownAttributes.Name.FullName));
                        request.AddExtension(fetch);
                        request.RedirectToProvider();
                        
                    }
                    catch (ProtocolException ex)
                    {
                        //ViewData["Message"] = ex.Message;
                        throw ex;
                    }
                }