richtexbox Text_Changed

Question

Hello Everyone..
I'm Newbie in C# language..

I have problem with my program,
I create a program that can print a content of richtextbos

--snip--

private void rtb_TextChanged(object sender, EventArgs e)
        {
               printbtn.PerformClick();
          
        }

---end snip--

I mean the program will do action, if content in richtexbox has been change to different content (word).
but it not work, the printbutton do action if i change with the same content.

what must i do ?

Thanks