how to return values from one class to another?

I'm making a program that has three classes:

1. Output class receives data from other two classes, writes to two new strings, combines with special formatting to another string and outputs it
2. AidaF class has a method that returns a value(a string) every second
3. GmailF class has a method that returns a value(a string) every minute or so

so i tired using return string; to return the data from classes 2 and 3 to the first class but that just returns the value to the current class, not to the first class.

Here is this code I'm working on, slimmed down a lot though. but basics are there.

namespace Final
{
    public class Output
    {
        public static void Main()
        {
            Console.WriteLine(gml + aida);
        }
    }

    public class AidaF
    {
        private static System.Timers.Timer aTimer;

        public static void AMain()
        {
            aTimer = new System.Timers.Timer(1000);
            aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
            aTimer.Interval = 1000;
            aTimer.Enabled = true;
        }


        private static void OnTimedEvent(object source, ElapsedEventArgs e)
        {开发者_如何学运维
            ...
            reader.ReadToFollowing("value");
            aida.Append(reader.ReadElementContentAsString()).Append(",");
            return aida;
            ...
        }
    }

    public class GmaillF
    {
        private static System.Timers.Timer gTimer;

        public static void GMain()
        {
            gTimer = new System.Timers.Timer(200000);
            gTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent1);
            gTimer.Interval = 200000;
            gTimer.Enabled = true;
        }

        private static void OnTimedEvent1(object source, ElapsedEventArgs e)
        {
            CheckMail();
        }

        public static string CheckMail()
        { 
          ...
          gml.Append(reader.ReadElementContentAsString()).Append(",");
          return gml;
          ...
        }
    }
}

You need to call the exposed static methods from the calling class in order to get this to work, so for example your main would look more like this:

public static void Main() {
Console.WriteLine(GmailF.CheckMail() + AidaF.OnTimedEvent());
}

I'm just guessing that CheckMail and OnTimedEvent are the strings you are trying to return. Both CheckMail and OnTimedEvent have to be public static strings for the above to work.