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    <p>You're making this more complex than you need to I think. If you start with a list of showtimes, then it's a simple matter of ordering to enumerate.</p> <pre><code>List&lt;Show&gt; startTimes = GetTimesFromDB(); var moviesGrouped = startTimes.GroupBy(x =&gt; x.Name); foreach(var group in moviesGrouped) { // print times for each movie } </code></pre> <p>To use a concrete example, lets use this sample:</p> <pre><code>List&lt;Sample&gt; sample = new List&lt;Sample&gt; { new Sample { Id = 1, Time = DateTime.Now }, new Sample { Id = 1, Time = DateTime.Now.AddDays(1) }, new Sample { Id = 2, Time = DateTime.Now.AddDays(2) }, new Sample { Id = 2, Time = DateTime.Now.AddDays(3) }, new Sample { Id = 3, Time = DateTime.Now.AddDays(4) }, }; foreach (var group in sample.GroupBy(x =&gt; x.Id)) { foreach (var element in group) { Console.WriteLine(element.Id); Console.WriteLine(element.Time); } } </code></pre> <p>You simply group by your token (in this case movie name), and then enumerate the grouping (which will contain your movie times). </p> <p>However, you could greatly simplify this by changing your object model.</p> <pre><code>public class Movie { public int MovieId { get; set; } public string Name { get; set; } public List&lt;Showing&gt; Showings { get; set; } } public class Showing { public DateTime StartTime { get; set; } public List&lt;Seat&gt; UnsoldSeats { get; set; } // Etc } </code></pre> <p>Then when you have a <code>List&lt;Movie&gt;</code>, it's already set up to do that display, and it naturally makes more sense than a simple showing class. </p> <pre><code>foreach(var movie in movies) { foreach(var showing in movie.Showings) // DoStuff } </code></pre>
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    1. POBuilding lists by selecting one item from each group of an IGrouping
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    1. COthanks for the answer, but I can't change the domain model. Your solution doesn't really explain how I would be able to combine all the showings of one movie with those of another. Could you please elaborate?
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    2. COUpdated with another sample.
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    3. COthanks, however I've already gotten to that point. I have a grouping already, and I tried enumerating it. In the second code sample of my question along with the explanation that follows, the part where I get stuck is how to build a list of every possible combination of datetimes. You're right, changing the domain model to the way you suggested would make enumerating easier, but that is not what I am having problems with. My problem is with buildling a list of DateTimes. My explanations are probably very poor, I added a summary to the bottom of my question if it helps.
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