Inserindo Varios DoCSV via EF

InserindoVariosDoCSVViaEF.cs

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            var ctx = new Contexto();
            ctx.Database.CreateIfNotExists();
            ctx.Configuration.AutoDetectChangesEnabled = false;
            ctx.Configuration.LazyLoadingEnabled = false;
            ctx.Configuration.ProxyCreationEnabled = false;
            ctx.Configuration.UseDatabaseNullSemantics = false;
            ctx.Configuration.ValidateOnSaveEnabled = false;
            var startNew = Stopwatch.StartNew();
            Console.WriteLine("Lendo csv");
            var clienteAgs = File.ReadLines(@"C:\Temp\VENDASTabelaGrade.csv").Skip(1)
                .AsParallel()
                .Select(l => l.Split('|'))
                .Select(l => new ClienteAg(l[0], l[1], l[2], l[3]))
                .ToList()
                .Partition(2000)
                .ToList();
            startNew.Stop();
            Console.WriteLine("Csv lido em: {0}", startNew.Elapsed);

            Console.WriteLine("Inserindo - Começando as {0:hh:mm:ss}", DateTime.Now);
            startNew.Restart();
            InserirTudo(clienteAgs, startNew);
            startNew.Stop();
            Console.WriteLine("Executado em: {0}", startNew.Elapsed);
        }

        public static void InserirTudo(List<List<ClienteAg>> clienteAgs, Stopwatch startNew)
        {
            var inseridos = 0;
            Parallel.ForEach(clienteAgs, items =>
            {
                var ctx = new Contexto();
                ctx.ClienteAgs.AddRange(items);
                Interlocked.Add(ref inseridos, ctx.SaveChanges());
                Console.WriteLine("Inseridos {0}", inseridos);
            });
        }


    }

    public static class MyClass
    {
        public static IEnumerable<List<T>> Partition<T>(this IList<T> source, Int32 size)
        {
            for (int i = 0; i < Math.Ceiling(source.Count / (Double)size); i++)
                yield return new List<T>(source.Skip(size * i).Take(size));
        }
    }

    public class ClienteAg
    {
        public ClienteAg()
        {

        }
        public ClienteAg(string uid, string vendaTabelaUid, string pcpGradeUid, string valor)
        {
            Uid = uid;
            VendaTabelaUid = vendaTabelaUid;
            PcpGradeUid = pcpGradeUid;
            Valor = valor;
        }

        public long Id { get; set; }

        public string Uid { get; set; }
        public string VendaTabelaUid { get; set; }
        public string PcpGradeUid { get; set; }
        public string Valor { get; set; }
    }

    public class Contexto : DbContext
    {
        public DbSet<ClienteAg> ClienteAgs { get; set; }
    }
}