Insert data into a real-time text box with Timer

Question

I’m using timer as follows:

System.Timers.Timer aTimer = new System.Timers.Timer();
aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
aTimer.Interval = 1000;
aTimer.Enabled = true;

In the method OnTimedEvent I’ll tell you what:

var auditoria = auditoriaBll.Retorna_Auditoria();

foreach (var item in auditoria)
{
    //menu e sub menu (categorias)
    if (item.Tabela.Equals("menus")) 
    {
        txtRelatorio.Text = andamento;
    }
}

The following error happens:

Invalid threaded operation: txtRelatory control accessed from a thread that is not the one in which it was created.

Answer 1

Basically, you can only access elements created in thread within this same thread. To solve, you need to use the method Invoke

var auditoria = auditoriaBll.Retorna_Auditoria();

foreach (var item in auditoria)
{
    //menu e sub menu (categorias)
    if (item.Tabela.Equals("menus")) 
    {
        this.Invoke(new MethodInvoker(() => txtRelatorio.Text = andamento));
    }
}