Presentation Layer
In the Presentation Layer, the code responsible for displaying user interface of the entire application is located. The common code placed in this layer are web forms. Web Forms consists of a .aspx file and .aspx.cs file.

In the Business Layer, the code that implements the business functionality of the Web ERP application is located. The business logic of an ERP application is implemented by using components....

The book titled "Develop an eRP software using vb.net and sql server"

explained the complete development using three-tier architecture.

Presentation Layer
In the Presentation Layer, the code responsible for displaying user interface of the entire application is located. The common code placed in this layer are windows forms, web forms, user controls and server controls.

Business Layer
In the Business Layer, the code that implements the business functionality of the application is located.

Data Access Layer
The Data Access Layer provides...