Which type if caching will be used if we want to cache the portion of a page instead of whole page?

It caches the portion of the page generated by the request. For that, we can create user controls.
For Example, Consider that you have web page which has many panels with details and Datagrid with details. But you want to take value from only one Panel and sent it across the server. In that scenario you can use Fragment Caching.

How to use Fragment Caching Check below link of our site:
http://www.dotnetfunda.com/articles/show/1484/how-to-implement-fragment-caching-in-aspnet