我怎样才能使我的图形更新

目前我正在做一个项目，需要你的CPU temperature，然后把它放在一个很酷的图形。但它只取给定的第一个值，然后停止。它不会一直更新。我试过while循环，但它们似乎不起作用。这是我当前的代码:

using System;
using System.Windows.Forms;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using OpenHardwareMonitor;
using OpenHardwareMonitor.Hardware;
namespace pc_version
{
    public class CircularProgressBar : Control
     {

    #region "Properties"
    private Color _BorderColor;
    public Color BorderColor
    {
        get { return _BorderColor; }
        set
        {
            _BorderColor = value;
            this.Invalidate();
        }
    }
    private Color _InnerColor;
    public Color InnerColor
    {
        get { return _InnerColor; }
        set
        {
            _InnerColor = value;
            this.Invalidate();
        }
    }
    private bool _ShowPercentage;
    public bool ShowPercentage
    {
        get { return _ShowPercentage; }
        set
        {
            _ShowPercentage = value;
            this.Invalidate();
        }
    }
    private int _BorderWidth;
    public int BorderWidth
    {
        get { return _BorderWidth; }
        set
        {
            _BorderWidth = value;
            this.Invalidate();
        }
    }
    private float _Value;
    public float Value
    {
        get { return _Value; }
        set
        {
 //----------------------------------GETTING THE CPU TEMPS--------------------------                
               Computer thisComputer;
                thisComputer = new Computer() { CPUEnabled = true };
                thisComputer.Open();
                String temp = "";
                List<String> list = new List<string>();
                foreach (var hardwareItem in thisComputer.Hardware)
                {
                    if (hardwareItem.HardwareType == HardwareType.CPU)
                    {
                        hardwareItem.Update();
                        foreach (IHardware subHardware in hardwareItem.SubHardware)
                            subHardware.Update();

                        //Temps
                        foreach (var sensor in hardwareItem.Sensors)
                        {
                            if (sensor.SensorType == SensorType.Temperature)
                            {
                                temp = sensor.Value.ToString();
                                int chunkSize = 2;
                                int stringLength = temp.Length;
                                for (int i = 0; i < stringLength; i += chunkSize)
                                {
                                    if (i + chunkSize > stringLength) chunkSize = stringLength - i;
                                    list.Add(temp.Substring(i, chunkSize));
                                }

                            }
                        }
                    }
                }
//  ---------------------------------- giving the graph a value--------------------
                float average = float.Parse(list[4]);

                _Value = average;
                this.Invalidate();
            }
        }
   // -----------------------------drawing the graph---------------------------------------------------------------
    #endregion
    #region "Constructor"
    public CircularProgressBar()
    {
        SetStyle(ControlStyles.AllPaintingInWmPaint, true);
        SetStyle(ControlStyles.ResizeRedraw, true);
        SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
        _Value = 100;
        _BorderColor = Color.Orange;
        _BorderWidth = 30;
        _ShowPercentage = true;
        _InnerColor = Color.DarkGray;
        this.ForeColor = Color.White;
    }
    #endregion


    #region "Painting"
    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);
        e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
        //Measure the single parts
        int Diameter = Math.Min(this.ClientSize.Width, this.ClientSize.Height);
        int InnerDiameter = Diameter - BorderWidth;
        Rectangle PieRect = new Rectangle(Convert.ToInt32(this.ClientSize.Width / 2 - Diameter / 2), Convert.ToInt32(this.ClientSize.Height / 2 - Diameter / 2), Diameter, Diameter);
        Rectangle InnerRect = new Rectangle(Convert.ToInt32(this.ClientSize.Width / 2 - InnerDiameter / 2), Convert.ToInt32(this.ClientSize.Height / 2 - InnerDiameter / 2), InnerDiameter, InnerDiameter);
        //Draw outer ring
        using (SolidBrush b = new SolidBrush(BorderColor))
        {
            e.Graphics.FillPie(b, PieRect, 0, Value / 100 * 360);
        }
        //Draw inner ring
        using (SolidBrush b = new SolidBrush(this._InnerColor))
        {
            e.Graphics.FillEllipse(b, InnerRect);
        }
        //Draw percentage
        if (ShowPercentage)
        {
            using (StringFormat sf = new StringFormat())
            {
                sf.Alignment = StringAlignment.Center;
                sf.LineAlignment = StringAlignment.Center;
                using (SolidBrush b = new SolidBrush(this.ForeColor))
                {
                    e.Graphics.DrawString(Convert.ToInt32(Value).ToString() + "°C", this.Font, b, InnerRect, sf);
                }
            }
        }
        this.Update();
    }
}
    #endregion
 }

这是结果的图像:http://pasteboard.co/PayHmNB.png

我如何添加到现有的代码，以保持更新的值和值的形式?谢谢你

Timer pollTimer = new System.Timers.Timer(1000); // fires every second
public void Initialize()
{
   // subscribe the PollTemperature function to the Elapsed event.
   pollTimer.Elapsed += PollTemperature;
   // Enable the periodic polling
   pollTimer.Enabled = true;
}
private float _Value;
public float Value
{
    get { return _Value; }
    set
    { 
       if(_value != value)
       {
          _value = value
       }
    }
 }
 public decimal GetTemperature()
 {
    // get the temperature of the cpu sensor here
    float yourTemperature = resultsOfYourLogic;
    return yourTemperature;
 }
 void PollTemperature(Object source, ElapsedEventArgs e)
 {
    Value = GetTemperature();
    this.Invalidate();
    this.Update();
 }