using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public class WinFlexCustomer

    {

      public string Name { get;set;}

      public int Id { get; set; }

​

      public WinFlexCustomer(int id, string name)

      {

        Id= id; Name = name;

      }

​

    }

    public static void Main()

    {

        var wfc = new WinFlexCustomer[5]{

                                       new WinFlexCustomer(1000,"A"),

                                       new WinFlexCustomer(1001,"B"),

                                       new WinFlexCustomer(1002,"C"),

                                       new WinFlexCustomer(1003,"D"),

                                       new WinFlexCustomer(1004,"E"),

​

                                       };

​

      var ids = new int[]{1001,1002};

​

      var result = wfc.Where(x => ids.Contains(x.Id)).Select( y => y.Name).ToArray();

        foreach(var p in result){

        Console.WriteLine(p);

        }

    }

}

​