What Should a .NET Project Have? A Practical Checklist for Developers

If you’ve ever kicked off a new .NET project, you probably know the temptation: jump straight into writing controllers and models, and before you know it, the project grows into an unstructured mess. A well-organized project, however, saves you and your team from headaches later—especially when it comes to scaling, testing, and maintaining the application.

So, what are the essentials a solid .NET project should include? Let’s walk through the key components that every professional .NET solution (particularly web APIs and enterprise applications) should have.

1. Project Structure That Makes Sense

A good starting point is a clean, predictable folder structure. Here’s one I often use:

/MyApp
│
├── Controllers/         --> Handle HTTP requests
├── Models/              --> DTOs, ViewModels, domain models
├── Services/            --> Business logic
├── Repositories/        --> Data access layer (EF Core, Dapper, etc.)
├── Interfaces/          --> Abstractions for services/repositories
├── Data/                --> DbContext, migrations
├── Middleware/          --> Custom middleware (logging, errors, etc.)
├── Utilities/Helpers/   --> Shared helpers (JWT, encryption, etc.)
├── wwwroot/             --> Static files (for web apps)
├── Tests/               --> Unit & integration tests
│
├── appsettings.json     --> Configurations
├── Program.cs           --> Entry point (setup, DI, logging, pipeline)
├── Startup.cs (optional)--> Used in older templates
├── MyApp.csproj         --> Project file

This structure gives clarity to anyone joining the project and enforces separation of concerns.

2. The Must-Haves

Let’s zoom into the important parts:

Program.cs / Startup.cs

• Configure dependency injection (DI), middleware, routing, and logging.

• This is the “wiring hub” of your application.

Dependency Injection (DI)

Promotes loose coupling and testability:

services.AddScoped<IUserService, UserService>();

appsettings.json

Configuration is king. Store:

• Connection strings

• API keys

• JWT secrets

• Environment-based overrides (Development, Production, etc.)

Logging

Use built-in logging or plug in something like Serilog or NLog for richer capabilities.

Error Handling

Centralize it with middleware so your APIs return consistent, predictable error messages.

Models / DTOs / ViewModels

Keep your domain entities separate from what you expose via APIs. This helps avoid overexposing your DB schema.

Data Access Layer

If you’re using EF Core:

• DbContext in /Data

• Migrations for schema evolution

• Optional repository pattern for abstraction

Services / Business Layer

Controllers should stay thin. Push business logic into services to keep things clean.

Authentication & Authorization

• JWT, cookies, or OAuth depending on your project.

• Secure routes using [Authorize].

Middleware

Useful for logging, request tracking, authentication, or handling CORS.

Unit & Integration Tests

Use xUnit, NUnit, or MSTest. Mock dependencies with Moq (or similar) for isolated testing.

API Documentation

Swagger/OpenAPI is almost non-negotiable these days:

builder.Services.AddSwaggerGen();

Static Code Analysis

Use tools like StyleCop, SonarQube, or ReSharper to enforce coding standards and catch potential issues early.

CI/CD Pipeline

Even for small projects, prepare for:

• Automated builds

• Tests

• Deployment (Azure DevOps, GitHub Actions, etc.)

3. Good-to-Have Extras

• Health Checks → Monitor app health (great for Kubernetes/Docker).

• Rate Limiting → Prevent abuse.

• Localization → If you’re targeting multi-lingual users.

• Feature Flags → Toggle features without redeploying.

• Secrets Management → Use Azure Key Vault or similar instead of hardcoding secrets.

In Summary

A well-structured .NET project isn’t just about writing code—it’s about designing for the future. At a minimum, your project should have:

• 🧠 Clean architecture

• 💡 Separation of concerns

• 🔄 Dependency injection

• 🧪 Unit & integration tests

• 🧾 Centralized logging & error handling

• 🔒 Secure authentication & authorization

• ⚙️ Config-driven environment setup

• 📦 Organized folders & maintainable structure

Getting these right from day one saves countless hours later. Your future self (and your teammates) will thank you.