title: Web browser control: Detecting changes in form content
body: <p>A <strong>form</strong> contains many elements, such as labels, Textbox, radio options box etc</p>
  
  <p><strong>How do you detect the user has changed a textbox input value, or has choosen a radio option within the content of a web browser control?</strong> (not the winform itself).</p>
  
  <p>Do you handle a winform event for when the mouse clicked or keyboard keys pressed? or is there a better way to detect changes in the web browser content?</p>