Starting and stopping a thread.

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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Threading;

public class Form1 : System.Windows.Forms.Form {
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label NumThreads;
private System.Windows.Forms.Label Counter;
private int fCounter;
private ArrayList fThreadList;

private System.ComponentModel.Container components = null;

public Form1() {
InitializeComponent();
fThreadList = new ArrayList();
}

protected override void Dispose(bool disposing) {
if (disposing) {
if (components != null) {
components.Dispose();

for (int i = 0; i < fThreadList.Count; ++i) { Thread fThread = (Thread)fThreadList[i]; fThread.Abort(); } } } base.Dispose(disposing); } private void InitializeComponent() { this.button1 = new System.Windows.Forms.Button(); this.button2 = new System.Windows.Forms.Button(); this.label1 = new System.Windows.Forms.Label(); this.label2 = new System.Windows.Forms.Label(); this.NumThreads = new System.Windows.Forms.Label(); this.Counter = new System.Windows.Forms.Label(); this.SuspendLayout(); this.button1.Location = new System.Drawing.Point(32, 104); this.button1.Name = "button1"; this.button1.TabIndex = 0; this.button1.Text = "&Start"; this.button1.Click += new System.EventHandler(this.button1_Click); this.button2.Location = new System.Drawing.Point(136, 104); this.button2.Name = "button2"; this.button2.Size = new System.Drawing.Size(88, 24); this.button2.TabIndex = 1; this.button2.Text = "&Stop"; this.button2.Click += new System.EventHandler(this.button2_Click); this.label1.Location = new System.Drawing.Point(32, 40); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(152, 16); this.label1.TabIndex = 2; this.label1.Text = "Number of Threads Running:"; this.label2.Location = new System.Drawing.Point(32, 64); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(100, 16); this.label2.TabIndex = 3; this.label2.Text = "Counter:"; this.NumThreads.Location = new System.Drawing.Point(192, 40); this.NumThreads.Name = "NumThreads"; this.NumThreads.Size = new System.Drawing.Size(64, 16); this.NumThreads.TabIndex = 4; this.Counter.Location = new System.Drawing.Point(192, 64); this.Counter.Name = "Counter"; this.Counter.Size = new System.Drawing.Size(64, 16); this.Counter.TabIndex = 5; this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(272, 165); this.Controls.AddRange(new System.Windows.Forms.Control[] { this.Counter, this.NumThreads, this.label2, this.label1, this.button2, this.button1}); this.ResumeLayout(false); } [STAThread] static void Main() { Application.Run(new Form1()); } protected void ThreadFunc() { Boolean done = false; while (!done) { Thread.Sleep(1000); fCounter++; this.Counter.Text = fCounter.ToString(); } } private void button1_Click(object sender, System.EventArgs e) { Thread fThread = new Thread(new ThreadStart(ThreadFunc)); fThread.Start(); fThreadList.Add(fThread); this.NumThreads.Text = fThreadList.Count.ToString(); } private void button2_Click(object sender, System.EventArgs e) { Thread fThread = (Thread)fThreadList[fThreadList.Count - 1]; fThread.Abort(); fThreadList.Remove(fThread); this.NumThreads.Text = fThreadList.Count.ToString(); } } [/csharp]