Load content without refreshing page in Asp .Net Web Forms

Question

Hi,

We have a web application build in Asp.net web forms. A typical layout of the dashboard page is, the header on top, Side menu on the left, and the content is on the right. I want to update the content without reloading the entire page. Also, The side menu should remain as it is (should not refresh) and only the content should refresh. So how can I achieve this? 

Can I just do it with HTML, CSS, and JavaScript in the design part or there is any backend work to do?

You can see an example of https://www.w3schools.com. Here on clicking the side menu, only the content changes and menu do not reload each time and the W3 school website is also build using Asp pages. I am looking forward to your answers.

Thanks.