title: How to show a notification to user when user moves to another page without saving data
body: <p>I have a asp.net page for data entry, I want to show a notification message to user when user moves out from the page without doing the Save process. How I can achieve this functionality in client side? </p>
  
  <p><strong>Edit :</strong></p>
  
  <p>I don't want to show the message when user just open the data entry page and left, if user something added or edited the data any of the field then only needs to show the message.</p>
  
  <p>Appreciate your help.</p>