C#

void Stop(object sender, RoutedEventArgs e)
        {
            button1.Click -= new RoutedEventHandler(Stop);
            button1.Click += new RoutedEventHandler(Start);
            button1.Content = "Start";
            //Do something here
        }

        void Start(object sender, RoutedEventArgs e)
        {
            button1.Click -= new RoutedEventHandler(Start);
            button1.Click += new RoutedEventHandler(Stop);
            button1.Content = "Stop";
            //Do something here
        }

private void Start(object sender, EventArgs e)
        {
            button1.Click -= new EventHandler(Start);
            button1.Click += new EventHandler(Stop);
            button1.Text = "Stop";
        }
        private void Stop(object sender, EventArgs e)
        {
            button1.Click -= new EventHandler(Stop);
            button1.Click += new EventHandler(Start);
            button1.Text = "Start";
        }

private void button1_click(object sender, EvenArgs e) {
    if (button1.Text == "Start") {
        button1.Text = "Stop";
        //Start the job
    } else {
        button1.Text = "Start";
        //Stop the job
    }
}

private bool started = false;

private void button1_click(object sender, EventArgs e) {
    if (!started) {
        button1.Text = "Stop";
        // Start the job
        // ...
        
        started = true;
    }
    else {
        button1.Text = "Start";
        // Stop the job
        // ...

        started = false;
    }
}

private Task someBigJob;

private void button1_click(object sender, EventArgs e) {
    if (someBigJob == null || !someBigJob.Running) {
        button1.Text = "Stop";
        // Start the job
        someBigJob.Start();
    }
    else {
        button1.Text = "Start";
        // Stop the job
        someBigJob.Stop();
    }
}

Wayne Gaylard wrote:

Can you tell us why ?

J4amieC wrote:

Because its just a better way of doing it.

J4amieC wrote:

Because the 2 buttons do a different job and therefore should not be the same button (separation of concern)

Bastard Programmer from Hell

var names = Enum.GetNames(typeof(EnumName));
/* the produced output will be:
None
Value1
Value2
Value3
Value13
Value4
Value24
*/

    List<EnumName> filtered = new List<EnumName>();
foreach (EnumName val in Enum.GetValues(typeof(EnumName)))
{
     if ((val & (val - 1)) == 0)
         filtered.Add(val);
}