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copied!<p>I think you should write: </p> <pre><code>var sortedList = from a in _assignmentControls join p in _priceLevels on a.ID equals p.ID orderby p.AnotherValue select a; </code></pre> <p>When you write from a in _assignmentControls - you are declaring a variable that refers to current element in a sequance that the operation to be performed on. And when you're calling select - you're projecting element from the sequence. Imagine it like conveyer.</p> <p>Let me give you some example with dump data:</p> <pre><code>public class SomeCLass { public int ID { get; set; } public string Name { get; set; } } public class AnotherClass { public int ID { get; set; } public int Value { get; set; } public int AnotherValue { get; set; } } public void TestMEthod() { List<SomeCLass> _assignmentControls = new List<SomeCLass>() { new SomeCLass() { ID = 1, Name = "test"}, new SomeCLass() { ID = 2, Name = "another test"} }; List<AnotherClass> _priceLevels = new List<AnotherClass>() { new AnotherClass() {ID = 1, AnotherValue = 15, Value = 13}, new AnotherClass() {ID = 2, AnotherValue = 5, Value = 13} }; var sortedList = //here you're declaring variable a that will be like caret when you going through _assignmentControls from a in _assignmentControls join p in _priceLevels on a.ID equals p.ID orderby p.AnotherValue select a; foreach (var someCLass in sortedList) { Console.WriteLine(someCLass.Name); } } </code></pre> <p>Result: </p> <pre><code>another test test </code></pre>

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