CSOM

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using ClientOM = Microsoft.SharePoint.Client;
using Microsoft.SharePoint.Client;

namespace SLCSTest
{
    public partial class MainPage : UserControl
    {
        Web oWebsite;
        ListCollection collList;
        IEnumerable<List> listInfo;

        public MainPage()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            ClientContext clientContext = ClientContext.Current;
            oWebsite = clientContext.Web;
            ListCollection collList = oWebsite.Lists;

            clientContext.Load(oWebsite,
               website => website.Title);

            listInfo = clientContext.LoadQuery(
               collList.Include(
                   list => list.Title,
                   list => list.Fields.Include(
                       field => field.Title).Where(
                       field => field.Required == true
                       && field.Hidden != true)));

            clientContext.ExecuteQueryAsync(onQuerySucceeded, onQueryFailed);
        }

        private void onQuerySucceeded(object sender, ClientRequestSucceededEventArgs args)
        {
            UpdateUIMethod updateUI = DisplayInfo;
            this.Dispatcher.BeginInvoke(updateUI);
        }

        private void onQueryFailed(object sender, ClientRequestFailedEventArgs args)
        {
            btnButton.Content  = "Request failed. " + args.Message + "\n" + args.StackTrace;
        }

        private void DisplayInfo()
        {
            btnButton.Content = "Title: " + oWebsite.Title;
            collList = oWebsite.Lists;

            foreach (List oList in listInfo)
            {
                btnButton.Content += "\n\tList: " + oList.Title;

                FieldCollection collField = oList.Fields;
                foreach (Field oField in collField)
                {
                    btnButton.Content += "\n\t\tField: " + oField.Title;
                }
            }
        }

        private delegate void UpdateUIMethod();
    }
}