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    <p>Here is an example using nested foreach loops, I'm not sure how you would do this in a single string of linq statements, maybe with lots of selectmanys?</p> <pre><code>var transactions = new[]{ new{Category = "1", Form = "1", Title = "Trans1" }, new{Category = "1", Form = "1", Title = "Trans2" }, new{Category = "1", Form = "1", Title = "Trans3" }, new{Category = "1", Form = "2", Title = "Trans1" }, new{Category = "1", Form = "2", Title = "Trans2" }, new{Category = "1", Form = "2", Title = "Trans3" }, new{Category = "2", Form = "1", Title = "Trans1" }, new{Category = "2", Form = "1", Title = "Trans2" }, new{Category = "2", Form = "1", Title = "Trans3" }, new{Category = "1", Form = "3", Title = "Trans1" }, new{Category = "1", Form = "3", Title = "Trans2" }, new{Category = "1", Form = "3", Title = "Trans3" }, }; foreach(var byCategory in transactions.GroupBy(x =&gt; x.Category)) { Console.WriteLine(byCategory.Key); foreach(var byForm in byCategory.GroupBy(x =&gt; x.Form)) { Console.WriteLine("\t" + byForm.Key); foreach(var trans in byForm) { Console.WriteLine("\t\t" + trans.Title); } } } </code></pre> <p>Just because I was curious what it would look like I came up with the following, YOU SHOULD NOT USE THIS IN PRODUCTION CODE as it is ridiculous (if you do have a data structure like this it should be broken up into something like <code>Dictionary&lt;CategoryName, FormGroup&gt;</code> or something with meaningful types)</p> <pre><code>Dictionary&lt;string, Dictionary&lt;string, List&lt;string&gt;&gt;&gt; tooManyDictionaries = transactions .GroupBy(x =&gt; x.Category) .ToDictionary( catGroup =&gt; catGroup.Key, catGroup =&gt; catGroup .GroupBy(x =&gt; x.Form) .ToDictionary( formGroup =&gt; formGroup.Key, formGroup =&gt; formGroup.Select(x =&gt; x.Title).ToList())); </code></pre>
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