使用委托参数在C＃中的类和形式之间传递数据

我必须从一个类传入值到RichTextBox。这里是我的代码。我必须传递值到任何工具像文本框，列表框，但我不知道如何。我必须使用代理将md值传递到两个方法并进入同一个富文本框。

I have to pass value into RichTextBox from a class. Here is my code. I have to pass values into any tools like textbox, listbox but I don't know how. I have to use delegates to pass md value to both methods and into the same richtextbox.

 namespace delegateEx2
{
    public class MyClass : Form1
    {
        delegate void MyDelegate(string MyString);

        public void ShowThoseMessages()
        {
            MyDelegate md = new MyDelegate(log1);
            md += log2;
            md("Error Log Text");
        }

        public void log1(string message) {

            //what can I write here to pass the md into the RichTextBox on Form1.cs
            //I tried something like Systems.Windows.Form.rtxblog but did not work 
            //......................................


        }

        public void log2(string message2)
        {

          //.....................................

        }

    }