The paper puts forward a kind of online shopping system based on ASP.NET technology,including the establishment of database and the design of the front web pages.The system uses Microsoft ASP.NET as development platform,C# as the server language,and Microsoft Visual Studio 2008 as the development tool.ADO.NET is used to connect with SQL SERVER 2000 database through the database controls.A variety of server controls are used to create the ASP.NET page to implement the system functions.The system is designed in 3-Layer application which includes Presentation Layer（PL）,Business Logic Layer（BLL）and Data Access Layer（DAL）.The operation of the database is in DAL,the logic function is in BLL.So the amount of work in the development,the difficulty of system maintenance and the upgrading can be reduced.After being tested,the system meets the requirement of the users.
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