using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var fooLIst = new List<FooBar>

        {

            new FooBar

            {

                Name = "Foo1",

                Tags = new List<string>

                {

                    "tag1",

                    "tag2"

                }

            },

            new FooBar

            {

                Name = "Foo2",

                Tags = new List<string>

                {

                    "tag3",

                    "tag4"

                }

            }

        };

        // using select to project

        var myNewListUsingSelect = fooLIst.Select(fb => new FooBar

                                                        {

                                                            Name = fb.Name,

                                                            Tags = new List<string>()

                                                        }).ToList();

        // option 1... just make a new list, then clear after

        var myNewList = new List<FooBar>(fooLIst);

        //myNewList.ForEach(fb => fb.Tags.Clear());

        Console.WriteLine("original name and tags: " + fooLIst[0].Name + " - " + fooLIst[0].Tags.Count);

        Console.WriteLine("list 1 name and tags: " + myNewList[0].Name + " - " + myNewList[0].Tags.Count);

        Console.WriteLine("select list 2 name and tags: " + myNewListUsingSelect[0].Name + " - " + myNewListUsingSelect[0].Tags.Count);

​

    }

​

}

​

class FooBar

{

  public string Name {get; set;}    

  public List<string> Tags {get; set;}  

}