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    <p>LINQ isn't all that useful for executing side effects, it's primarily intended for <em>querying</em>. In truth, the fact that it has deferred execution so engrained in its behaviour makes it a <em>poor choice</em> for executing side-effects, IMO.</p> <p>The code you've got looks perfectly fine to me. If you did want to use LINQ though, I doubt you could improve much on:</p> <pre><code>foreach (var o in obj.Where(i =&gt; i.SomeProperty == Something)) { o.SomeOtherProperty = true; } </code></pre> <p>Now, that isn't all that better (arguably worse) than your original.</p> <p>On the other hand, if you wanted to create a <em>new,</em> streaming sequence with <em>projections</em> of the original items having the desired characteristics, you could do something like:</p> <pre><code>var projection = obj.Where(i =&gt; i.SomeProperty == Something) .Select(i =&gt; new Foo(i) { SomeOtherProperty = true }); // assuming your type has a copy-constructor </code></pre> <p><strong>EDIT</strong>: If you don't want to heed the advice of the experts (read: Eric Lippert), you can write your own extension-method:</p> <pre><code>public static void Do&lt;T&gt;(this IEnumerable&lt;T&gt; source, Action&lt;T&gt; action) { if (source == null) throw new ArgumentNullException("source"); if (action == null) throw new ArgumentNullException("action"); foreach (T item in source) action(item); } </code></pre> <p>This will allow you to do:</p> <pre><code>obj.Where(o =&gt; o.SomeProperty == Something) .Do(o =&gt; o.SomeOtherProperty = true); </code></pre>
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    1. POC# Linq - SET syntax from SQL, i.e. SET abc (a property of obj) WHERE xyz = true in IEnumerable<obj>
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    1. COI've never seen the term "copy constructor" used in the C# context.
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    2. COYou don't hear about copy constructors in C# because C# doesn't use them. You can create `public Foo(Foo copy)` constructors, but since the compiler doesn't implicitly generate calls to them, it doesn't matter whether they actually produce copies (as they must in C++). If your C# constructor actually does create a copy, I suppose "copy constructor" is a cromulent term for it.
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    3. CO@Gabe: Just found this: http://msdn.microsoft.com/en-us/library/ms173116(VS.80).aspx
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