using System.ComponentModel.DataAnnotations;

 namespace BookStore.Models {
  public class Book {

   public int Id { get; set; }
    [ Display( Name = "Book Title" ) ]
    [ Required ]
    [ StringLength( maximumLength: 20,
       ErrorMessage = "The Title length should be between 2 and 20.",
       MinimumLength = 2 ) ]

   public string Title { get; set; }
   public string Genre { get; set; }

   public List<string> Authors { get; set; }
    [ DataType( DataType.Currency ) ]
    [ Range( 1, 100 ) ]

   public decimal Price { get; set; }
    [ Display( Name = "Publish Date" ) ]
    [ DataType( DataType.Date ) ]

   public DateTime PublishDate { get; set; }
  }
 }

 using System.Diagnostics;
 using BookStore.Models;
 using Microsoft.AspNetCore.Mvc;

 namespace BookStore.Controllers {
  public class HomeController: Controller {
   private readonly ILogger<HomeController> _logger;

   public HomeController( ILogger<HomeController> logger ) {
    _logger = logger;
   }

   public IActionResult Index( ) {
    return View( );
   }
        
   public IActionResult Privacy( ) {
    return View( );
   }
   [ ResponseCache( Duration = 0, Location = ResponseCacheLocation.None,
     NoStore = true ) ]

   public IActionResult Error( ) {
    return View( new ErrorViewModel { RequestId = Activity.Current?.Id ??
     HttpContext.TraceIdentifier } );
   }

   public IActionResult Details( ) {
    Book book = new Book( ) {
     Id = 1,
     Title = "Learning ASP.NET Core 2.0",
     Genre = "Programming & Software Development",
     Price = 45,
     PublishDate = new System.DateTime( 2012, 04, 23 ),
     Authors = new List<string> { "Jason De Oliveira", "Michel Bruchet" }
    };
    return View( book );
   }

   // GET: Books/Create
   public ActionResult Create( ) {
    return View( );
   }

   // POST: Books/Create
   [HttpPost]
   [ValidateAntiForgeryToken]
   public ActionResult Create( [ Bind( "Id,Title,Genre,Price,PublishDate" )] Book book ) {
    try {
     // TODO: Add insert logic here
     return RedirectToAction( nameof( Index ) );
    }
    catch {
     return View( book );
    }
   }

   // GET: Books/Edit/5
   public ActionResult Edit( int id ) {
    return View( );
   }

   // POST: Books/Edit/5
   [HttpPost]
   [ValidateAntiForgeryToken]
   public ActionResult Edit( int id, IFormCollection collection ) {
    try {
     // TODO: Add update logic here
     return RedirectToAction( nameof( Index ) );
    }
    catch {
     return View( );
    }
   }

   // GET: Books/Delete/5
   public ActionResult Delete( int id ) {
    return View( );
   }

   // POST: Books/Delete/5
   [HttpPost]
   [ValidateAntiForgeryToken]
   public ActionResult Delete( int id, IFormCollection collection ) {
    try {
     // TODO: Add delete logic here
     return RedirectToAction( nameof( Index ) );
    }
    catch {
     return View( );
    }
   }

   public IEnumerable<Book> GetBooks( ) {
    List<Book> books = new List<Book>( );
    Book book1 = new Book( ) {
     Id = 1,
     Title = "Learning ASP.NET Core 2.0",
     Genre = "Programming & Software Development",
     Price = 45,
     PublishDate = new System.DateTime( 2017, 12, 14 )
    };
    books.Add( book1 );

    Book book2 = new Book( ) {
     Id = 1,
     Title = "Pro ASP.NET Core MVC",
     Genre = "Programming & Software Development",
     Price = 85,
     PublishDate = new System.DateTime( 2016, 09, 15 ),
    };
    books.Add( book2 );

    return books;
   }
  }
 }