ToString com encode quebrado no R$

Porque esta dando esse erro ? segui conforme a aula.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;

namespace web
{
    public class Startup
    {
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.

        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            var livros = new List<Livro>();
            livros.Add(new Livro("001", "Quem mexeu na Minha Query", 12.99m));
            livros.Add(new Livro("002", "Fique Rico com C# R$", 30.99m));
            livros.Add(new Livro("003", "Java Para Baixinhos", 25.99m));

            app.Run(async (context) =>
            {
                   foreach(var livro in livros)
                {
                    await context.Response.WriteAsync($"{livro.Codigo,-10}{livro.Nome,-40}{livro.Preco.ToString("C"),10}\r\n");
                }

            });
        }
    }
}