With the development of the Internet and the rapid development of e-commerce, online shopping platforms have become popular. In recent years, driven by the spirit of the state's advocacy of economizing campuses, many campuses have seen a boom in second-hand commodity trading. It is necessary to make full and reasonable use of second-hand goods, so this article considers that it is necessary to establish a campus second-hand market trading website based on the actual selection of multiple universities. The campus second-hand market transaction system is a typical example of the integration of computer technology and economics technology. Using this system can timely release transaction information and complete online transactions. The system discussed in this article is a combination of C# and SQL, based on the B/S mode of web application software, to achieve the collection and management of student secondary market trading goods related information. This article first analyzes the background and significance of building a campus secondary market trading system, and proposes a website design idea; then introduces the tool technology required to build a campus secondary market trading system, and finally explains the design of each module required by the system Give the overall functional design and database design of the website.
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