How do I use updatePanel in asp.net without refreshing all page?

asp.net, c#, updatepanel

Solution

Read these tutorials Asp.net Update Panel and Introduction to the UpdatePanel Control

Simple and understandable

Problem

I want to design a website which contains sub-categories of a product in asp.net(c#). When I clicked a sub-category, then an image of product must be shown and the main page shouldn't be refreshed. How can I succeed it?

Original source