Question

Can someone please tell me why I’m getting the error “object reference is required” for the call to CheckForMessage” in the last line. Thanks.

class Program
{
    private void CheckForMessage(object source, ElapsedEventArgs e)
    {
        Random random = new Random();
        Console.WriteLine("Checking for new Messages");
        if ((random.Next(9) == 0)) { Console.WriteLine("hello mum"); } else { Console.WriteLine("no message"); }
    }
    static void Main(string[] args)
    {
         Timer pollTimer=new Timer(100);
    pollTimer.Elapsed+=new ElapsedEventHandler(CheckForMessage);


    }
}

Answer 1

You’re trying to call an instance method (CheckForMessage) without an instance of a class. Just change it to a static method instead:

private static void CheckForMessage(object source, ElapsedEventArgs e)