Dynamic Web Page is a web page which is controlled by server side scripting. This allows to change the webpage as per visitor. In server side scripting the parameters at server-side change as per the user(Client-side) load the webpage the processing of the web-page is carried with the scripting and then those HTML files are sent to client side. Client side the HTML files are loaded on its web browser. The best example of the dynamic web-pages is the reservation system where multiple users log in the session to reserve the seats in transport system and is updated if reservation or cancellation takes place. E-commerce is another such example that requires dynamic webpages for customers at different locations simultaneously log to place the order for similar items, the inventory is then updated for new users.
ASP.NET technology is developed by Microsoft and is an open source platform for developing dynamic web pages, web applications and web services. It is a combination of 2 technologies ASP-Active Server Pages and .Net.