// @nuget: EntityFramework

​

using System;

using System.Data.Entity;

using System.Linq;

using System.Collections.Generic;

using System.Diagnostics;

public class Program

{

    public static void Main()

    {

        List<Customer> list = Data();

        // SaveChanges

        using (var context = new CustomerContext())

        {           

            // list contains 2000 records       

            context.Customers.AddRange(list);

            context.SaveChanges();

            FiddleHelper.WriteTable(context.Customers.Take(5).ToList());

        }

    }

    public static List<Customer> Data() 

    {

        List<Customer>  list = new List<Customer>();

        for(int i = 0; i < 2000; i++)

        {

            list.Add(new Customer() { Name ="Customer_" + i});

        }

        return list;

    }

​

    public class CustomerContext : DbContext

    {

        public CustomerContext() : base(FiddleHelper.GetConnectionStringSqlServer())

        {

​

        }

        public DbSet<Customer> Customers { get; set; }

    }

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Name { get; set; }

    }

}