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    <blockquote> <blockquote> <p>Will this pass the tags list by reference</p> </blockquote> </blockquote> <p>No. The <em>list object</em> is passed "by value" (but see next). (<code>ref</code> or <code>out</code> is required to <a href="http://en.wikipedia.org/wiki/Evaluation_strategy#Call_by_reference" rel="nofollow">"pass by reference"</a> in C#, but that is not being done here, nor does it need to be.)</p> <blockquote> <blockquote> <p>and modify the original passed list?</p> </blockquote> </blockquote> <p>Yes. This is because the <em>list object</em> is passed. And <em>that list object</em> is mutated. Passing a reference type (anything defined with <code>class</code>) <em>never</em> implicitly makes a copy/clone/duplicate. An object is what it is.</p> <p>Now, back to "pass by value": the "value passed" is the value of the "reference" (internal, no need to concern with this): this calling strategy is better known as <a href="http://en.wikipedia.org/wiki/Evaluation_strategy#Call_by_sharing" rel="nofollow">Call/Pass By Object Sharing</a> in a langauge like C#. The <em>same object</em> is <em>shared</em> (just as if it were assigned to two different variables). (Value types -- a <code>struct</code> -- are different in that they (<em>often</em>) are copied/duplicated on the stack, but a <code>List&lt;T&gt;</code> is a <code>class</code>.)</p> <blockquote> <blockquote> <p>Or should I be doing something along the lines of </p> </blockquote> </blockquote> <p>It depends upon the desired semantics. Is the caller <em>expecting</em> the side-effects directly or indirectly? Can the mutation side-effect lead to unexpected scenarios? Make sure to document it either way. (I prefer the way that guarantees the initial object is not mutated.)</p> <p>Hope that clears some things up.</p> <p>Happy coding.</p>
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    1. COPlease explain -1. I don't mind, but without an explanation it does no good.
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    2. COMy only nitpick here is how you refer to the "List object" being passed by value. This is misleading at best. The object is what's sitting on the heap. The reference is passed by value, yes, but to continue to say *list object* strikes me as odd. BTW, I removed the -1 after I read it over again. I misunderstood you a bit due to the issue I mention above the first time around.
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    3. CO@Ed S. I hope the edits cleaned that up some. I was trying to focus on the fact than an object is ... itself, no matter by what name (variable) it goes by. It still does start a little strong though.
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