Question

I am trying to use the timer class in C# for this TCM Updater and I keep getting an error: “Delegate to an instance method cannot have null ‘this’.”

I thought I would just have to add “this” to the beginning of the function, but still getting that error. Any idea what I might need to do?

this is the code I am using (error on function call 5 lines down):

public Form1()
{
  InitializeComponent();
  updateTimer = new System.Timers.Timer(10000);
  updateTimer.Elapsed += new ElapsedEventHandler(this.onUpdateEvent);   <--- Error here
  updateTimer.Interval = 2000;
  updateTimer.Enabled = true;
}

private void OnUpdateEvent(object source, ElapsedEventArgs e)
{
    Console.WriteLine("The Elapsed event was raised at {0}", e.SignalTime);
}

Answer 1

Change this: updateTimer.Elapsed += new ElapsedEventHandler(this.onUpdateEvent);

To this: updateTimer.Elapsed += new ElapsedEventHandler(OnUpdateEvent);

Or the simplified syntax (as others have suggested): updateTimer.Elapsed += OnUpdateEvent;