Updating UI in C# using Timer

Question

I am working on making my application that reads data from the serial port and updates a gauge on the UI more efficient and I wanted to ask for some advice on my code that

Answer 1

This is the second time I provide a WPF solution for a winforms problem.

Just copy and paste my code in a file -> new project -> WPF Application and see the results for yourself.

Also take a look at how simple this code really is (I'm using random values, so you can remove that and adapt it to your needs).

The drawing I used (the part in XAML) is not adequate for a Gauge. I just had that Path already drawn and I'm too lazy to create a new one. You should create a new drawing (I recommend using Expression Blend). But you can see the Rotation being applied and how fast it works.

using System;
using System.Threading;
using System.Windows;
using System.ComponentModel;

namespace WpfApplication4
{
    public partial class Window2
    {
        public Window2()
        {
            InitializeComponent();
            DataContext = new ViewModel();
        }
    }

    public class ViewModel: INotifyPropertyChanged
    {
        private double _value;
        public double Value
        {
            get { return _value; }
            set
            {
                _value = value;
                NotifyPropertyChange("Value");
            }
        }

        private int _speed = 100;
        public int Speed
        {
            get { return _speed; }
            set
            {
                _speed = value;
                NotifyPropertyChange("Speed");
                Timer.Change(0, value);
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        public void NotifyPropertyChange(string propertyName)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }

        private System.Threading.Timer Timer;

        public ViewModel()
        {
            Rnd = new Random();
            Timer = new Timer(x => Timer_Tick(), null, 0, Speed);
        }

        private void Timer_Tick()
        {
            Application.Current.Dispatcher.BeginInvoke((Action) (NewValue));
        }

        private Random Rnd;
        private void NewValue()
        {
            Value = Value + (Rnd.Next(20) - 10);
        }
    }
}

XAML: