title: Alphanumeric Textbox - Validate/Sanitize clipboard text before paste
body: <p>On my <code>Textbox</code> only accepts Alphanumeric characters and a underscore using the <code>Keypressed</code> event but I am having problems when I right click on the textbox and pasted special characters and accepts it</p>
  
  <p><a href="https://i.stack.imgur.com/dQTKl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dQTKl.png" alt="enter image description here"></a></p>
  
  <p>Is there a way to validate the string from there before clicking paste?</p>
  
  <p>Any answers will help thanks!</p>