What is the three-tier architecture of ASP.NET? What are some good examples? Can enterprise library be used to build a three-tier architecture?

In fact, the three-layer structure looks mysterious on the surface, but it is actually a very simple thing. Let's just say. General simple programming is to write code on the page, read and write the database, and display data. This can be seen as two floors. The presentation layer includes the method, code and data logic processing of reading and writing database, presentation layer and database layer. In this case, if you just want to modify something on the performance page or change the page, then all your code will have to be rewritten, which is troublesome, and for the website, the page is modified very frequently. So in this way, the presentation layer will no longer write the code of database and logic processing, but make these codes into functions and call them only on the page, so that if the page is modified, the calling function does not need to be modified, and if the data logic is modified, the page does not need to be moved, thus becoming the so-called three-layer structure, namely, the presentation layer, the business logic layer and the database layer.

As for examples, you can search online. There are three layers of source code all over the street.