Add administration pages to an existing website(repost)

We need to add administration pages to our website. These administration pages will allow for easy input and modification of the vendors data into the database. Administration includes interface to add and modify data in all lookup and system tables. Existing project is done in C#.net 2.0 with Ajax extensions and SQL 2000 DB. You will have to create a new project for administration pages. The DB access has to be separated in a different layer, probably as a library. There is no requirement to heavy graphic designer work, but pages need to look good and be easy to read. The website uses .NET membership and all administration pages will only be accessed by authorized users. Adding a new data needs to perform check if the vendor already exists and if yes to perform update. It also needs to provide very simple search to find a vendor by name or address. Information needs to be shown in pages with ability for the admin user to choose how many rows to show at a time. Detailed requirements document will be provided. We will also provide the existing project code + SQL insert statements (or database backup file) for you to replicate the database on your own server. This will guarantee easy integration of your code. The code you provide will be reviewed and only if approved will be integrated in the real website.