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using System;
using static System.Console;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
 
public class Program {
	public static void Main() {
        foreach (var c in GetColumns()) WriteLine(c);
	}
	private static IEnumerable<string> GetColumns() => typeof(Usuario).GetProperties()
			.Where(e => e.Name != "Id" && !(Attribute.GetCustomAttribute(e, typeof(NotMappedAttribute)) is NotMappedAttribute))
			.Select(e => e.Name);
}
 
public class Usuario {
	[Required]
	public string Nome { get; set; }
 
	[Required]
	public string Login { get; set; }
 
	[Required]
	public string Password { get; set; }
 
	[NotMapped]
	[Required]
	public string ConfirmPassword { get; set; }
}
 
//https://pt.stackoverflow.com/q/362423/101

prog.cs(4,29): error CS0234: The type or namespace name `DataAnnotations' does not exist in the namespace `System.ComponentModel'. Are you missing an assembly reference?
prog.cs(5,29): error CS0234: The type or namespace name `DataAnnotations' does not exist in the namespace `System.ComponentModel'. Are you missing an assembly reference?
Compilation failed: 2 error(s), 0 warnings

Standard output is empty