can't stop this timer

[sagey]

i'm trying to display the time in seconds in a label on a form.
i'm trying to loop until the timer has stopped but when i do try and stop the timer the app takes no notice and carries on executing the loop and eventually the app does not respond and i have to kill it.

this is the code from the form. i assume its something to do with the code executing on another thread. or something.

		private void button1_Click(object sender, System.EventArgs e)
		{			
				aTimer.Start();
				while(Stopped == false)
				{
					label1.Text = aTimer.Duration.ToString();
				}
		}

		private void button2_Click(object sender, System.EventArgs e)
		{
			aTimer.Stop();
			Stopped = true;
			label1.Text = aTimer.Duration.ToString();
			
		}

the timer i'm using this is class that i found somewhere on the net
that should produce a hi resolution timer. (cos i want to create a stopwatch like application).

using System;
using System.Runtime.InteropServices;
using System.ComponentModel;
using System.Threading;

namespace HighResTimer
{
	public class HighResTimer
	{
		[DllImport("Kernel32.dll")]
		private static extern bool QueryPerformanceCounter(out long lpPerformanceCount);
		[DllImport("Kernel32.dll")]
		private static extern bool QueryPerformanceFrequency(out long lpFrequency); 
		private long startTime ;
		private long stopTime;
		private long freq;
		/// <summary>
		/// ctor
		/// </summary>
		public HighResTimer()
		{
			startTime = 0;
			stopTime = 0;
			freq =0;
			if (QueryPerformanceFrequency(out freq) == false)
			{ 
				throw new Win32Exception(); // timer not supported
			}
		} 
		/// <summary>
		/// Start the timer
		/// </summary>
		/// <returns>long - tick count</returns>
		public long Start()
		{
			QueryPerformanceCounter(out startTime);
			return startTime;
		}
		/// <summary>
		/// Stop timer 
		/// </summary>
		/// <returns>long - tick count</returns>
		public long Stop()
		{
			QueryPerformanceCounter(out stopTime);
			return stopTime;
		} 
		/// <summary>
		/// Return the duration of the timer (in seconds)
		/// </summary>
		/// <returns>double - duration</returns>
		public double Duration
		{
			get
			{
				return (double)(stopTime - startTime) / (double) freq;
			}
		}
		/// <summary>
		/// Frequency of timer (no counts in one second on this machine)
		/// </summary>
		///<returns>long - Frequency</returns>
		public long Frequency 
		{
			get
			{
				QueryPerformanceFrequency(out freq);
				return freq;
			}
		}
	}
}

any help would be appreciated.

[DevGrp]

Why are you using that timer? The framework has two timers you can use.
Anyway where is the variable Stopped declared? It might have something to do with that.

[sagey]

thanks for the reply

i'm using the highrestimer class because i need a high resolution timer. the app that i plan to use this in will have a stopwatch in it so i need to keep displaying the time elapsed.

Stopped is declared as a class variable of the form as such

private bool Stopped;

if anyone can help i would really appreciate it. this seems like such a simple thing that i am trying to do.

1) start the timer

2) whilst timer is running constantly/frequently get the elapsed time and display it in a label(textbox/whatever)

3) stop the timer and display the final elapsed time

[sagey]

if anyone can help i would really appreciate it. almost all the examples i've found of using timers just use the timer control or something equally inaccurate.

I know this class works i just don''t know how to call the duration in such a way that it updated the label with the duration and knows when i have clicked the stop button