C # Three layer development to do student management system

1. Define each layer

2. Add a reference between each layer

The DAL layer calls model

The BLL layer invokes the DAL and model

The UI layer calls the BLL and model layers

Model layer for each layer invocation

3. Create entity classes based on database, one entity class per table

4. Call the Mytool class and the SqlHelper class at the DAL layer to add system. Configuration Reference

and Write app. Config

Calling System.Configuration reference in the SqlHelper class

5.DAL Layer Code: Main SQL statements and conversions

6..BLL layer Invocation, (function is to isolate the UI layer and the DAL layer)

7. The Code of the main form, (UI layer, display the corresponding information to the user)

8. Complete the diagram.

C # Three layer development to do student management system