在WP8中验证来自服务器的登录数据

Question

我需要为我的应用程序提供身份验证...并且使用email-id和密码我需要发布和放置数据..我是WP8的新手，所以任何人都可以告诉我如何提供认证..

当我点击login按钮时..它应该从网址（服务器）验证电子邮件ID和密码，并应重定向到新页面。

我的XAML代码..

<TextBlock HorizontalAlignment="Left" Height="45" Margin="26,79,0,0" TextWrapping="Wrap" Text="E-Mail ID" VerticalAlignment="Top" Width="115"/>
            <TextBlock HorizontalAlignment="Left" Height="45" Margin="26,159,0,0" TextWrapping="Wrap" Text="Password" VerticalAlignment="Top" Width="115"/>
            <TextBox x:Name="txt_email" HorizontalAlignment="Left" Height="75" Margin="141,49,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="292" InputScope="EmailSmtpAddress"/>
            <TextBox x:Name="txt_password" HorizontalAlignment="Left" Height="80" Margin="141,139,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="292" InputScope="Password"/>
            <Button x:Name="btn_loin" Content="Log-In" HorizontalAlignment="Left" Height="80"  VerticalAlignment="Top" Width="180" Click="btn_loin_click" Margin="141,254,0,0"/>

注册用户的以下代码工作正常...我需要使用注册用户执行下一个功能序列，如ADD /删除等。

我的注册btn_Click代码..

public void btn_register_click(object sender, RoutedEventArgs e)
        {
            register = populateRegisterDetails();
            var objid = App.Current as App;
            string registerDetails = GetJsonSerializeObject(register);
            this.register = client.addNewRegistration(registerDetails);           
            NavigationService.Navigate(new Uri("/HomePage.xaml",UriKind.Relative));
        }

通过静态传递电子邮件和密码，我的代码运作良好.....

//添加新组织..

public Organization addNewOrganization(string organizationDetails)
    {

    String email="far@c.com";
    String password ="qq";

    JsonClient client = new JsonClient();
    string servicePath = ORGANIZATION_SERVICE + "?"+"email="+email+"&"+"sig="+password;
    Organization organizationregisteredDetails = client.Post<Organization>(servicePath, organizationDetails);
    return organizationregisteredDetails;
}

我的默认发布方法代码工作正常.....

public T Post<T>(string servicePath, string result)
        {

            string serviceURL = REST_URI + servicePath;
            Uri URI = new Uri(serviceURL);
            System.Net.WebClient webClient = new WebClient();
            webClient.Headers["ContentType"] = "application/json";
            webClient.Headers["Accept"] = "application/json";
            webClient.UploadStringCompleted += this.sendPostCompleted;
            webClient.UploadStringAsync(URI, HTTP_POST, result);
            return default(T);
        }

如果有人指导我，我会很有帮助。