title: Display a alert box in ASP.net c# web application
body: <p>I want to display a alert message when a user clicks on button.</p>
  
  <p>I have a button "<code>Signed</code>" on click of this button I want to display a alert message saying "<code>Are you sure you want to continue?</code>" and two buttons in this alert message box "<code>Yes</code>" and "<code>No</code>".</p>
  
  <p>On click of yes button I want a <code>update function</code> to be executed and on click of "<code>No</code>" only Alert should get closed and no changes in the current page.</p>
  
  <p>Please anyone can guide me how to go on with this?</p>