// Controllers/TodoController.cs
using Microsoft.AspNetCore.Mvc;
using System.Collections.Generic;

namespace WebApiExample.Controllers {
    [ApiController]
    [Route("api/[controller]")]
    public class TodoController : ControllerBase {
        private static List<Todo> todos = new List<Todo> {
            new Todo { Id = 1, Title = "Sample Task", Completed = false }
        };

        [HttpGet]
        public IEnumerable<Todo> Get() => todos;

        [HttpPost]
        public ActionResult<Todo> Post(Todo todo) {
            todo.Id = todos.Count + 1;
            todos.Add(todo);
            return CreatedAtAction(nameof(Get), new { id = todo.Id }, todo);
        }
    }

    public class Todo {
        public int Id { get; set; }
        public string Title { get; set; }
        public bool Completed { get; set; }
    }
}

Demonstrates a simple ASP.NET Core Web API controller for managing Todo items.