1. What is Windows DNA Framework?

 DNA-(Distributed iNterNet Applications)

-          a framework that describes how to develop:

•       multi-tier

•        high performance

•       scalable distributed applications

over the network.

The Windows DNA Framework Diagram

The Business Objects

•       represents the data that will travel between on each layer.

The Presentation Layer

•       responsible for :

–      information gathering from the user;

–       performing basic validation of user input;

–      sending it to the business layer;

–      receiving results of the business layer ;

–      presenting results to the user in viewable formats such as C# forms.

The Business Access Layer

•       responsible for:

–       receiving input from the presentation layer;

–       interacting with the data access layer to process the information and;

–       sending back the processed information to the presentation layer.

The Data Layer

•       directly interacts with the data, which usually reside in the databases such as MS SQL Server.

•       responsible for:

–      storage;

–      retrieval and;

–      general maintenance of data as well as integrity of data.