using System;
using System.Linq;

public class Test
{
	public static void Main()
	{
var list1 = new[] { new { ID = 1 }, new { ID = 2 }, new { ID = 3 } };
var list2 = new[] {
	new {
		ID = 1,
		Name = "Jason"
	},
	new { 
		ID = 1,
		Name = "Jim"
	},
	new {
		ID = 2,
		Name = "Mike"
	},
	new {
		ID = 3,
		Name = "Phil"
	}
};

var lst = list1
	// Select distinct IDs that are in both lists:
	.Where(lst1 => list2
		.Select(lst2 => lst2.ID)
		.Contains(lst1.ID))
	.Distinct()
	// select items in list 2 matching the IDs above:
	.Select(lst1 => list2
		.Where(lst2 => lst2.ID == lst1.ID)
		.First());		

            foreach(var item in lst)
            {
                Console.WriteLine("ID: {0}, Name: {1}", item.ID, item.Name);
            }
	}
}