Thank you for reply Nilsan!

I Preferred this method for adding delay to highligh effect. When user onmouseouting of gridview highlight delayin 1000ms. 

Can you help me for this ? 

When page loading everything is working fine. But when checking row (postback) highlight dont work! 

I tried to register script but did not help. 

<script>
function load() {
   //register the handler
   Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
}
//this handler will execute after a partial postback
function EndRequestHandler(){
   //...arbitrary code...
}
window.onload = load;
</script>