The basic C# code required to send commands to a LEGO EV3 on windows and receive sensor data. A copy of the dll from https://legoev3.codeplex.com/ is required.

MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Lego.Ev3.Core;
using Lego.Ev3.Desktop;
using System.Diagnostics;

namespace LegoLogger
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        Brick _brick;
        public MainWindow()
        {
            InitializeComponent();
        }

        private async void Grid_Loaded(object sender, RoutedEventArgs e)
        {
            _brick = new Brick(new BluetoothCommunication("COM3"));
            _brick.BrickChanged += _brick_BrickChanged;
            await _brick.ConnectAsync();
            await _brick.DirectCommand.PlayToneAsync(50, 1000, 300);

        }

        private void _brick_BrickChanged(object sender, BrickChangedEventArgs e)
        {
            Debug.WriteLine(_brick.Ports[InputPort.One].SIValue);
            Debug.WriteLine(_brick.Ports[InputPort.A].SIValue);
            Debug.WriteLine(_brick.Ports[InputPort.B].SIValue);
        }
    }
}