All of the tutorials we’ve examined so far have used a tiered architecture consisting of presentation, Business Logic, and Data Access layers. The Data Access Layer (DAL) was crafted in the first tutorial (Creating a Data Access Layer) and the Business Logic Layer in the second (Creating a Business Logic Layer). Starting with the Displaying Data With the ObjectDataSource tutorial, we saw how to use ASP.NET 2.0’s new ObjectDataSource control to declaratively interface with the architecture from the presentation layer.
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AutoCAD Map 3D is the leading engineering GIS platform for creating and managing spatial data. AutoCAD Map 3D bridges CAD and GIS by providing direct access to data, regardless of how it is stored, and by enabling the use of AutoCAD® tools for maintaining a broad variety of geospatial information.

Using Open Source FDO Data Access Technology, AutoCAD Map 3D natively accesses spatial data stored in relational databases, files, and Web-based services, providing easy management of large geospatial data sets while streamlining entire workflows.
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