BlazorEditForms/Model/Employee.cs

using System.ComponentModel.DataAnnotations;

namespace BlazorEditForms.Model;

public class Employee
{
    [Required]
    [MinLength(3)]
    public string Code { get; set; } = string.Empty;
    public string Firstname { get; set; } = string.Empty;
    public string Lastname { get; set; } = string.Empty;
    public IList<PhoneNumber> PhoneNumbers { get; set; } = [];
}