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What is 3 layer architecture in asp.net in 3 Layer Architecture of Asp.net/Ado.net/C#.net(Dotnet)
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3 Layers 
  1. Presentation Layer
  2. Business Layer
  3. Data Layer
Presentation Layer 
Presentation Layer is the layer in which the users interact with an application. Presentation layer contents Shared UI code, Code Behind and Designers used to represent information to user.
Business Layer 
Business Layer is mainly working as the bridge between Data Layer and Presentation Layer. All the Data passes through the Business Layer before passing to the presentation Layer. Business Layer is the sum of Business Logic Layer, Data Access Layer and Value Object and other components used to add business logic.
Data Layer 
Data Layer is basically the server which stores all the application’s data. Data Layer contents Database Tables, XML Files and other means of storing Application Data.
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