C#

<br />
using System;<br />
using System.Drawing;<br />
using System.Collections;<br />
using System.ComponentModel;<br />
using System.Windows.Forms;<br />
using System.Data;<br />
using System.Timers;<br />
using System.Threading;<br />
<br />
namespace WindowsApplication14<br />
{<br />
	/// <summary><br />
	/// Summary description for Form1.<br />
	/// </summary><br />
	public class Form1 : System.Windows.Forms.Form<br />
	{<br />
		private System.Windows.Forms.ListBox listBox1;<br />
		private System.Windows.Forms.Button button1;<br />
		private System.Timers.Timer timerClock = new System.Timers.Timer();<br />
		/// <summary><br />
		/// Required designer variable.<br />
		/// </summary><br />
		private System.ComponentModel.Container components = null;<br />
<br />
		public Form1()<br />
		{<br />
			//<br />
			// Required for Windows Form Designer support<br />
			//<br />
			InitializeComponent();<br />
<br />
			//<br />
			// TODO: Add any constructor code after InitializeComponent call<br />
			//<br />
		}<br />
<br />
		public void InitializeTimer()<br />
		{<br />
			this.timerClock.Elapsed += new ElapsedEventHandler(OnTimer);<br />
			this.timerClock.Interval = 2000;<br />
			this.timerClock.Enabled = true;<br />
		}<br />
<br />
		/// <summary><br />
		/// Clean up any resources being used.<br />
		/// </summary><br />
		protected override void Dispose( bool disposing )<br />
		{<br />
			if( disposing )<br />
			{<br />
				if (components != null) <br />
				{<br />
					components.Dispose();<br />
				}<br />
			}<br />
			base.Dispose( disposing );<br />
		}<br />
<br />
		#region Windows Form Designer generated code<br />
		/// <summary><br />
		/// Required method for Designer support - do not modify<br />
		/// the contents of this method with the code editor.<br />
		/// </summary><br />
		private void InitializeComponent()<br />
		{<br />
			this.listBox1 = new System.Windows.Forms.ListBox();<br />
			this.button1 = new System.Windows.Forms.Button();<br />
			this.SuspendLayout();<br />
			// <br />
			// listBox1<br />
			// <br />
			this.listBox1.Location = new System.Drawing.Point(8, 8);<br />
			this.listBox1.Name = "listBox1";<br />
			this.listBox1.Size = new System.Drawing.Size(120, 95);<br />
			this.listBox1.TabIndex = 0;<br />
			// <br />
			// button1<br />
			// <br />
			this.button1.Location = new System.Drawing.Point(8, 112);<br />
			this.button1.Name = "button1";<br />
			this.button1.Size = new System.Drawing.Size(120, 23);<br />
			this.button1.TabIndex = 1;<br />
			this.button1.Text = "Run";<br />
			this.button1.Click += new System.EventHandler(this.button1_Click);<br />
			// <br />
			// Form1<br />
			// <br />
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);<br />
			this.ClientSize = new System.Drawing.Size(136, 142);<br />
			this.Controls.Add(this.button1);<br />
			this.Controls.Add(this.listBox1);<br />
			this.Name = "Form1";<br />
			this.Text = "Form1";<br />
			this.Load += new System.EventHandler(this.Form1_Load);<br />
			this.ResumeLayout(false);<br />
<br />
		}<br />
		#endregion<br />
<br />
		/// <summary><br />
		/// The main entry point for the application.<br />
		/// </summary><br />
		[STAThread]<br />
		static void Main() <br />
		{<br />
			Application.Run(new Form1());<br />
		}<br />
<br />
		private void Form1_Load(object sender, System.EventArgs e)<br />
		{<br />
			listBox1.Items.Add("Arthur");<br />
			listBox1.Items.Add("Alex");<br />
			listBox1.Items.Add("Amie");<br />
			listBox1.Update();<br />
		}<br />
<br />
		private void OnTimer(object source, ElapsedEventArgs e)<br />
		{<br />
			this.nextvalue();<br />
		}<br />
<br />
		private void button1_Click(object sender, System.EventArgs e)<br />
		{<br />
			this.nextvalue();<br />
		}<br />
<br />
		private void nextvalue()<br />
		{<br />
			for(int i = 0;i<listBox1.Items.Count;i++)<br />
			{<br />
				listBox1.SetSelected(listBox1.Items.Count-i,true);<br />
			}<br />

I am trying to get the CPU usage percent of a given process (in this example, iTunes). This example always prints "iTunes is using 0.0000% CPU":

Console.Out.WriteLine("iTunes is using {0:0.0000%} CPU",
	new PerformanceCounter("Process", "% Processor Time", "iTunes").NextValue());

What am I doing wrong? The Performance program under Administrative Tools in Windows XP correctly displays the CPU usage of iTunes using these exact arguments to the constructor of PerformanceCounter. In a different section of code, using _Total as the instance name properly retrieves the total CPU usage of the system.

(the emoticons are quote followed by P that got parsed by this forum)