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Old February 1st, 2007, 10:25 AM
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Default Help with Timer and BackgroundWorker

Hi, After starting below code, the output I got is:
It should be:
I don`t knowo why the backgroud worker starts more then 1 time on each steps, is Background worker cancelletion working right?
Please help.

        private void Form1_Load(object sender, EventArgs e)

            timer1.Interval = 3000;
            timer1.Tick += new EventHandler(DayTicker);

        public void DayTicker(object sender, EventArgs e)
            if (backgroundWorker1.IsBusy) backgroundWorker1.CancelAsync();
            if (backgroundWorker1.CancellationPending) return;

            richTextBox1.Text += "\n day   \n";

            backgroundWorker1.WorkerReportsProgress = true;
            backgroundWorker1.WorkerSupportsCancellation = true;
            backgroundWorker1.DoWork += new DoWorkEventHandler(bw_DoWork_day);
            backgroundWorker1.RunWorkerCompleted += bw_workerday_coplete;


        public void bw_DoWork_day(object sender, DoWorkEventArgs e)
            string w = "minute";
            e.Result = 1;

            e.Cancel = true;

            if (InvokeRequired)
                Invoke(new Change(OnChange), w);

        public void bw_workerday_coplete(object sender, RunWorkerCompletedEventArgs e)
           if (e.Error != null)
                MessageBox.Show("Worker exception: " + e.Error.ToString());
            else if (e.Cancelled)
                timer1.Tick += new EventHandler(DayTicker);

        private void OnChange(string w)
            richTextBox1.Text += w + ",";

        private delegate void Change(string w);
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