How to prevent page post back in Grid view

You have to install ajax control toolkit through nuget packet manager or directly adding dll in reference and do configurations in web.config than use Update Panel.

 

http://www.aspsnippets.com/Articles/Assign-PostBack-Trigger-Full-PostBack-for-LinkButton-inside-GridView-within-AJAX-UpdatePanel-in-ASPNet.aspx

 

Refer to this link will help