In this article, we have first introduced the two famous Ajax frameworks, Prototype and script.aculo.us, because of their important positions in the web tag system. In fact, for brevity, we have only showed you their parts of Ajax related functionalities with related examples.

Next, we introduced the general system requirements of the web tag system to develop. In fact, as you have imaged, a web tag application holds only a few functions. So, there are merely two tables designed in the system. As a typical three-tiered application, we selected to leverage stored procedures to encapsulate the data in the tables, as well as Microsoft SqlHelper class to simplify the data access operations. In the second section, we will start to write the web tag application in details.