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copied!<p>These partial methods are extension points you can use - if you need and wish to do so:</p> <pre><code>partial void InsertPerson(Person instance); </code></pre> <p>This means, you can - if you wish - implement a function that gets called each time a <code>Person</code> object is being inserted in your data context.</p> <p>A partial function will be removed by the linker if it's not been implemented in any way - so there's no performance penalty of any kind.</p> <p>However, <strong>if</strong> you implement it, it will be called and can be used to tweak the way the system behaves.</p> <pre><code>partial void OnLastNameChanging(string value); partial void OnLastNameChanged(); </code></pre> <p>For each property on your entities, you'll get two partial methods that allow you to hook into a time just before your property gets changed (<code>OnLastNameChanging</code>), or just after the change has been made (<code>OnLastNameChanged</code>). You'd use the first method typically for validation - check the new validation and throw an exception if you don't like it for some reason.</p> <p>You'd use the second method typically to do additional housekeeping or updating other properties, once your "lastname" has been changed.</p> <p>Partial methods are a new C# 3.0 (.NET 3.5) feature - read more about them <a href="http://geekswithblogs.net/sdorman/archive/2007/12/24/c-3.0---partial-methods.aspx" rel="nofollow noreferrer">here</a> and <a href="http://community.bartdesmet.net/blogs/bart/archive/2007/07/28/c-3-0-partial-methods-what-why-and-how.aspx" rel="nofollow noreferrer">here</a>.</p> <p>Marc</p>

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