Build a Complete Product CRUD API with ASP.NET Core (.NET 10)

Creating a clean, well-documented CRUD API is a foundational skill for modern backend development. In this guide, we’ll walk through a production-ready Product CRUD API built with ASP.NET Core Web API (.NET 10, C# 14)—covering design principles, full controller logic, testing, Swagger integration, and clear next steps for scaling to production.

Overview

This API demonstrates RESTful best practices using a simple in-memory store to keep the focus on clarity and correctness. It’s ideal for learning, demos, interviews, and as a starting point for real projects.

What you’ll get

• Full CRUD operations (Create, Read, Update, Delete)
• Clean REST endpoints and named routes
• Correct HTTP status codes
• Strongly-typed responses
• Swagger/OpenAPI for instant testing
• Clear testing workflows (.http, Swagger, Postman)

Typical use cases

• E-commerce product catalogs
• Inventory management systems
• Mobile app backends
• Third-party integrations

Product Model

Location: CRUD Operation/Product.cs namespace CRUD_Operation

{ 
    public class Product 
    { 
        public int Id { get; set; } 
        public string? Name { get; set; } 
        public string? Description { get; set; } 
        public decimal Price { get; set; } 
        public int Stock { get; set; } 
        public string? Category { get; set; } 
    } 
}