ASP.NET Core MVC 2.0 Cookbook

How to do it...

1. First of all, let's create a class with validation attributes. These attributes will be used on both the client side and the server side:

public class ProductViewModel{  public int Id { get; set; }  [Required]  [RegularExpression(@"^[a-zA-Z]{1,40}$",  ErrorMessage = "The field must be a string")]  public string Name { get; set; }  [Required]  [Range(0.01, double.MaxValue,  ErrorMessage = "Please enter a positive number")]  public decimal Price { get; set; }}

2. In addition to this, we will create a form in order to post the ProductViewModel. This is the Form version of  TagHelpers:

<form asp-controller="Home" asp-action="AddProduct" method="post" asp-antiforgery="true">  <div asp-validation-summary="None"></div> <div class="form-group"> ...