Help with events in C#(beginer's question)

[GilligansGhost]

I need help getting 3 classes to talk to each other. A gui, a delegate library, and the actual working class.(no pun intended)

In this example i want the button to start a short thread that will output to the rich text box rtbLog. I would be very thankful if someone could walk me through this.

        private void btn_TimedTurn_Click(object sender, EventArgs e)
        {
            log Timedexec = new log();
            Timedexec.start();
        }
        private class log
        {
            public void start(){
                for(int i=1; i<=20 ;i++)
                {
                    Thread.Sleep(300);
 
                }
            }
        }
 
        private void rtbLog_TextReciver(string income)
        {
            rtbLog.AppendText(income);
        }