title: calling javascript function on OnClientClick event of a Submit button
body: <p>In my asp.net page, I have three text boxes and one button.<br>
  First two text boxes are being used to get the value from the user and third one is being used to show the sum of first two boxes.  </p>
  
  <p>I am calling a javascript function to sum the values and show the result value on <code>OnClientClick</code> event of that BUTTON.</p>
  
  <p>JS function is working fine but when I am pressing button to get the sum, it shows the result in third text box and just then the page is being post-back and result value becomes disappear from the third text box.</p>
  
  <p>Why the post-back is called by the button?<br>
  I don't want page to be post-backed on click of submit button.</p>
  
  <p>Any suggestion is appreciated.</p>