title: How to paste text to RichTextBox as a plain text
body: <p>If I copy some text with different format and paste it to my richtextbox it is not plain I mean its format will be copied as well.</p>
  
  <p>Is there anyway I can copy-paste as a plain text?
  By the way my program is on WinForm</p>
  
  <p>thanks for any answer</p>