title: How to prevent richTextBox to paste images within it?
body: <p>I am programming in c#. and I've a richTextBox on it.</p>
  
  <p>At runtime, I insert some Bitmap images into richTextbox by coding.
  But I want to prevent user that drag my inserted Images or paste some other images in richTextBox.</p>
  
  <p>How can I implement that?</p>
  
  <p>thanks in advance!</p>