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copied!<p><strike>Are you looking for a <a href="http://en.wikipedia.org/wiki/Linked_list" rel="nofollow">Linked List</a>?</p> <p>I've used it for linking the data of a wizard together so we know exactly what data is used on each page.</strike></p> <p>Maybe you can tell us what you want to use it for?</p> <p><strong>Update:</strong> </p> <p>Below is a little example of how you can use Linq grouping to get what you're looking for. Paste it in a console app to see the results.</p> <pre><code>class Program { static void Main(string[] args) { User user1 = new User { UserName = "Tom" }; User user2 = new User { UserName = "Pete" }; List<UserChoice> userChoices = new List<UserChoice> { new UserChoice { User = user1, ChosenValue = "chosenValue1", Year = 1994 }, new UserChoice { User = user1, ChosenValue = "chosenValue3", Year = 1995 }, new UserChoice { User = user1, ChosenValue = "chosenValue1", Year = 1996 }, new UserChoice { User = user1, ChosenValue = "chosenValue2", Year = 1997 }, new UserChoice { User = user1, ChosenValue = "chosenValue2", Year = 1998 }, new UserChoice { User = user1, ChosenValue = "chosenValue1", Year = 1999 }, new UserChoice { User = user1, ChosenValue = "chosenValue2", Year = 2000 }, new UserChoice { User = user2, ChosenValue = "chosenValue3", Year = 1994 }, new UserChoice { User = user2, ChosenValue = "chosenValue1", Year = 1995 }, new UserChoice { User = user2, ChosenValue = "chosenValue2", Year = 1996 }, new UserChoice { User = user2, ChosenValue = "chosenValue3", Year = 1997 }, new UserChoice { User = user2, ChosenValue = "chosenValue1", Year = 1998 }, new UserChoice { User = user2, ChosenValue = "chosenValue2", Year = 1999 }, new UserChoice { User = user2, ChosenValue = "chosenValue1", Year = 2000 } }; var choicesByYear = (from uc in userChoices group uc by uc.Year into g select new { Year = g.Key, UserChoicesByYear = g }); foreach (var item in choicesByYear) { Console.WriteLine("Choices for year: " + item.Year); foreach (var userChoice in item.UserChoicesByYear) { Console.WriteLine(userChoice.User.UserName + " chose " + userChoice.ChosenValue.ToString()); } } Console.ReadKey(); } } public class UserChoice { public User User { get; set; } public int Year { get; set; } public object ChosenValue { get; set; } } public class User { public string UserName { get; set; } } </code></pre>

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