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Three Tier Architecture: Very Easy to understand, the three tier are: 1. Presentation layer 2. Business Layer 3. Database Layer Simple Example: Lets take example of a Songs and Artist. 1. DataAccess Layer Below is a class of Data Access Layer, that has some dummy/fudge data, we only write DataBase calling method in DataAccessLayer. using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace DataBaseLayer {     public class DataAccessLayer     {         string [] ArtistName = { "Akon" , "Shakira" , "Michael_Jackson" };         string [] Shakira = { "Waka Waka" , "Addicted to you" , "Beautiful Liar" };         string [] Akon = { "Chammak Challo" , "Lonely" , "Dont Matter" };         string [] Michael_Jackson = { "Beat It" , "Danger...