cant pass parameter to method?

Anytime you add an event handler, you need to add it according to the event delegate's signature. See ElapsedEventDelegate (http://msdn2.microsoft.com/en-us/library/system.timers.elapsedeventhandler(VS.71).aspx) in msdn for a code snippet.

Here's a snippet from the docs (notice how the OnTimeEvent method is declared and called?).

public class Timer1
{

public static void Main()
{
System.Timers.Timer aTimer = new System.Timers.Timer();
aTimer.Elapsed+=new ElapsedEventHandler(OnTimedEvent);
// Set the Interval to 5 seconds.
aTimer.Interval=5000;
aTimer.Enabled=true;

Console.WriteLine("Press \'q\' to quit the sample.");
while(Console.Read()!='q');
}

// Specify what you want to happen when the Elapsed event is raised.
private static void OnTimedEvent(object source, ElapsedEventArgs e)
{
Console.WriteLine("Hello World!");
}
}