// @nuget: EntityFramework

​

using System;

using System.Data.Entity;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        // Insert data

        using (var context = new EntityContext())

        {

            context.Customers.AddRange(Data());

            context.SaveChanges();

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

        }

        // RemoveRange: Remove data

        using (var context = new EntityContext())

        {

            var list = context.Customers.Where(c => c.CustomerID <= 500).ToList();

            context.Customers.RemoveRange(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 < 1000; i++)

        {

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

        }

        return list;

    }

​

    public class EntityContext : DbContext

    {

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

        {

​

        }

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

    }

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Name { get; set; }

        public string Code { get; set; }

    }

}