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    <p>It depends on how you have set up your data contract.</p> <p>In WCF, using all the defaults, your service will use the DataContractSerializer (DCS) to serialize your object into XML. The DCS will serialize your fields in order - first the public ones, then the private ones. Within each visibility group, it will order the fields/properties alphabetically by name.</p> <p>Thus, if you introduce a new public property <code>MiddleName</code> and you already had <code>FirstName</code> and <code>LastName</code>, you would be fine: the old XML would have been</p> <pre><code>&lt;YourObject&gt; .... &lt;FirstName&gt;.....&lt;/FirstName&gt; &lt;LastName&gt;.....&lt;/LastName&gt; &lt;/YourObject&gt; </code></pre> <p>and your new one would just simply add a new property at the end:</p> <pre><code>&lt;YourObject&gt; .... &lt;FirstName&gt;.....&lt;/FirstName&gt; &lt;LastName&gt;.....&lt;/LastName&gt; &lt;MiddleName&gt;....&lt;/MiddleName&gt; &lt;/YourObject&gt; </code></pre> <p>Such an update "add something at the end" should work just fine, the DCS will just simply ignore additional tags in the XML. </p> <p>However: had you introduced a property called <code>Gender</code>, that would be stuck <strong>between</strong> <code>&lt;FirstName&gt;</code> and <code>&lt;LastName&gt;</code> and would thus break the order of the data in your XML and thus would break the data contract - no "old" client will be able to call your new service.</p> <p>In order to take control of this, you can put specific <code>Order=</code> attributes on your data members in your data contract:</p> <pre><code>[DataContract] public class SomeAddress { [DataMember(Order=0)] public string FirstName; [DataMember(Order=1)] public string LastName; } </code></pre> <p>Then you could easily add a new property - just add it to the end of the list!</p> <pre><code>[DataContract] public class SomeAddress { [DataMember(Order=0)] public string FirstName; [DataMember(Order=1)] public string LastName; [DataMember(Order=2)] public string Gender; } </code></pre> <p>So by using the <code>Order=</code> attribute on your data contracts, you can take control of your XML layout, and you can make simple extensions of existing data contracts non-breaking updates.</p> <p>For more background and in-depth know-how, you ought to read <a href="https://web.archive.org/web/20140519204507/http://msdn.microsoft.com:80/en-us/magazine/cc163569.aspx" rel="nofollow noreferrer">Serialization in Windows Communication Foundation</a> on MSDN Magazine's web site - highly recommended.</p>
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    1. COI will try this but is the expected error the "Could not load assembly" version that I am getting?
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    2. COThat did it. I did not change order of any existing members but added Order=2 to new members. The next version will have Order=3 on all new members and so on.
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