When working with Entity Framework, you can choose between two main approaches: Code-First and Database-First. Each approach serves a different purpose and suits different project needs.

What is Code-First Approach?

The Code-First approach allows developers to define their database schema using C# or VB.NET classes. The database is automatically created or updated based on the code.

Steps to Use Code-First:

1. Step 1: Create a new class to represent a database table.

   public class Product {
       public int Id { get; set; }
       public string Name { get; set; }
       public decimal Price { get; set; }
   }
                           

2. Step 2: Create a DbContext class to manage database interactions.

   public class AppDbContext : DbContext {
       public DbSet Products { get; set; }
   }
                           

3. Step 3: Run migrations to create the database.
   • Run the command: dotnet ef migrations add InitialCreate
   • Run the command: dotnet ef database update

Now, you can interact with the database using the `Products` table mapped from the `Product` class.

What is Database-First Approach?

The Database-First approach is used when you already have a database and want to generate C# or VB.NET classes from its schema. These classes allow you to interact with the existing database.

Steps to Use Database-First:

1. Step 1: Ensure the database is set up with tables and data.
2. Step 2: Use the Entity Framework tools to generate classes.
   • Run the command: dotnet ef dbcontext scaffold "YourConnectionString" Microsoft.EntityFrameworkCore.SqlServer
3. Step 3: The scaffolded classes and DbContext will be created, mapping to the database schema.

Now, you can work with the database using the generated classes.

Comparison:

Conclusion:

Both approaches are powerful and suitable for different scenarios. Use Code-First for new projects where you control the database design. Opt for Database-First when working with an existing database.