csharpTechStore.cs

namespace TechStore.Models
{
    public class Product
    {
        public int Id { get; set; }

        [Required(ErrorMessage = "El nombre del producto es obligatorio.")]
        public string Name { get; set; }

        public string Description { get; set; }

        [Required(ErrorMessage = "El precio del producto es obligatorio.")]
        [Range(0.01, double.MaxValue, ErrorMessage = "El precio debe ser mayor que cero.")]
        public decimal Price { get; set; }

        public decimal IGV => Price * 0.18m; // Calcula el IGV como el 18% del precio
    }
}

using Microsoft.AspNetCore.Mvc;
using TechStore.Models;

namespace TechStore.Controllers
{
    public class ProductController : Controller
    {
        public IActionResult Add()
        {
            return View();
        }

        [HttpPost]
        public IActionResult Add(Product product)
        {
            if (ModelState.IsValid)
            {
                return RedirectToAction("Index", "Home"); 
            }
            return View(product);
        }
    }
}