Migration

Entidade:
--
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;

namespace Pharm.Dominio.Entidades
{
    public class Produtos
    {
        public int Id { get; set; }

        [Required(ErrorMessage = "É necessário preencher o código de barras")]
        [DisplayName("Código de barras")]
        public int codigoBarras { get; set; }
        public string nome { get; set; }
        public string descricao { get; set; }
        public decimal precoMinimo { get; set; }
        public decimal precoMaximo { get; set; }
    }
}



----------------------------------
Contexto:

using System.Data.Entity;
using Pharm.Dominio.Entidades;
using System.Data.Entity.ModelConfiguration.Conventions;

namespace Pharm.Dominio.Repositorio
{
    public class Contexto : DbContext
    {
        public DbSet<Produtos> Produtos { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuider)
        {
            modelBuider.Conventions.Remove<PluralizingTableNameConvention>();
        }
    }
}


--------------------------------------
App.config

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <connectionStrings>
    <add name="Contexto" connectionString="Data Source=(local);Initial Catalog=Pharm;User ID=sa;Password=****" providerName="System.Data.SqlClient" />
  </connectionStrings>
  <configSections>
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="mssqllocaldb" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>