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    <p>If it ain't broke, don't fix it. Of course, if you have confidence in your unit tests, you can give it a whirl, but you shouldn't really go randomly changing code "just because".</p> <p>Of course - in some cases, simplifying code is a valid reason to make a change - but even something as innocent as switching to an auto-implemented property could break code that makes assumptions and uses reflection to update the fields directly. Or it could break serialization.</p> <p>Changing to "var" can actually give you a different (more specific) type, which might cause a different method overload to get selected, etc.</p> <p>So again; it comes down to your confidence in the unit tests.</p> <p>Other considerations:</p> <ul> <li>does the rest of the team understand the new syntax yet?</li> <li>does your project need to support C# 2.0 (for example, some open source projects might want to retain compatibility with C# 2.0).</li> </ul> <p>If neither of these are an issue, you should be OK to use the new features in new code... just be a <em>little</em> cautious before hitting "update all" on old code...</p> <p>Here's a trivial example of "var" as a breaking change:</p> <pre><code> static void Main() { using (TextReader reader = File.OpenText("foo.bar")) { // [HERE] Write(reader); } } static void Write(TextReader reader) { Console.Write(reader.ReadToEnd()); } static void Write(StreamReader reader) { throw new NotImplementedException(); } </code></pre> <p>Now switch to <code>var reader</code> on the line marked <code>[HERE]</code>...</p>
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