There are many reasons to upgrade your existing 'legacy' Web Forms applications. One of the main reasons would be performance. Are your pages just taking too long to load? Is every form submit taking more than a few seconds to respond? Users will usually get frustrated at this, especially if there is no 'Loading' panel or other visual indicator. This is usually the sign of a web application that was not written from the ground up to be as fast as possible. Web Forms apps (written in the standard way) with very 'heavy' pages will take a long time to load every time the user interacts with a page. This is usually because of the fact that a postback is actually occurring. A postback is when the user presses a submit button somewhere on the form, and the entire page, is sent to the server, but more importantly, the entire page is again written back from the server, which causes a 'double whammy' effect of very slow page load times. These applications can usually be quickly changed to use lightweight javascript libraries, along with Web services, as a way to request and submit data from the page. In this way, only the minimum amount of data is actually loaded, and sent back and forth to the server. So, every time a user loads a page or performs any action requiring data to be sent back and forth to the server, only the essential data is sent back and forth, and not the entire page.


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