1. Presentation Layer
The presentation layer is the topmost layer of the 3-tier architecture in C#. It is responsible for handling the user interface and presenting the data to the user. This layer is typically implemented using technologies such as ASP.NET, Windows Forms, or WPF.
In the presentation layer, the user interacts with the application through various UI elements such as buttons, textboxes, and dropdowns. The layer is responsible for capturing user input and displaying the output to the user. It also handles the validation of user input and provides feedback to the user.
The presentation layer communicates with the business logic layer to retrieve and update data. It sends requests to the business logic layer and receives responses containing the requested data or the result of an operation.
Some common components of the presentation layer include:
- User interface elements (buttons, textboxes, etc.)
- UI logic for handling user input and displaying output
- Validation logic for validating user input
- Communication with the business logic layer
2. Business Logic Layer
The business logic layer is the middle layer of the 3-tier architecture in C#. It contains the business rules and logic of the application. This layer is responsible for processing the data received from the presentation layer and performing any necessary calculations or operations.
The business logic layer is where the core functionality of the application resides. It encapsulates the business rules and ensures that the data is processed correctly. This layer is typically implemented using classes and methods that represent the different entities and operations of the application.
The business logic layer communicates with the data access layer to retrieve and store data. It sends requests to the data access layer to retrieve data from the database or to update the data in the database.
Some common components of the business logic layer include:
- Business entities or models
- Business rules and logic
- Methods for processing data and performing operations
- Communication with the data access layer
3. Data Access Layer
The data access layer is the bottommost layer of the 3-tier architecture in C#. It is responsible for interacting with the database and performing CRUD (Create, Read, Update, Delete) operations on the data.
The data access layer is typically implemented using technologies such as ADO.NET, Entity Framework, or NHibernate. It provides an abstraction layer between the application and the database, allowing the application to work with the data without directly interacting with the database.
The data access layer is responsible for executing SQL queries or stored procedures to retrieve and update data in the database. It also handles the mapping between the database schema and the application’s data models.
Some common components of the data access layer include:
- Data access classes or repositories
- Methods for executing SQL queries or stored procedures
- Mapping between the database schema and the application’s data models
- Communication with the database
In conclusion, the 3-tier architecture in C# consists of three main components: the presentation layer, the business logic layer, and the data access layer. Each layer has its own responsibilities and interacts with the other layers to create a modular and scalable application.
