C# Excel datascraper to integrate with exisiting design

The project is to go to a destination site and write a c# application to download excel file and put it into database. Write database tables and query to retrieve and send the data to database. The developer should modify existing engine to schedule this job to be run at a specified interval. Datasource for data is: [[login to view URL] A][1]ll tables - table 3a. The data needs to relate to existing tables and there is a burden to understand the existing system. Technologies - c#,.Net3.5, Sql Server 2005, T-Sql, asp.net, Excel.