C#

Service cannot be started. System.Configuration.ConfigurationErrorsException: There is no endpoint behavior named 'metadataBehavior'. 
  at System.Configuration.BaseConfigurationRecord.EvaluateOne(String[] keys, SectionInput input, Boolean isTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult)
  at ...

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 ?