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    <p>For any object which lifetime must explicitly managed (such as objects that implement <code>IDisposable</code>) or matters to the user, try not to inject them, but inject a factory that allows creating such objects instead. Define this interface for instance:</p> <pre><code>public interface IDbDataContextFactory { dbDataContext CreateNew(); } </code></pre> <p>And use it as follows:</p> <pre><code>public class SqlPupilBlockService { private IDbDataContextFactory contextFactory; public SqlPupilBlockService( IDbDataContextFactory contextFactory) { this.contextFactory = contextFactory; } public void DoSomeOperation() { using (var db = this.contextFactory.CreateNew()) { // use the dbDataContext here. } } } </code></pre> <p>An implementation of would be very simple, like this:</p> <pre><code>public class DbDataContextFactory : IDbDataContextFactory { public dbDataContext CreateNew() { return new dbDataContext(); } } </code></pre> <p>And registration goes like this:</p> <pre><code>Bind&lt;IDbDataContextFactory&gt;().To&lt;DbDataContextFactory&gt;(); </code></pre> <p>The use of a factory makes it very explicit who is the owner of the created object and who should control its lifetime. This makes your code more readable and follows the <a href="http://en.wikipedia.org/wiki/Principle_of_least_astonishment" rel="nofollow noreferrer">principle of least surprise</a>.</p> <p><strong>UPDATE</strong></p> <p>More than a year has past since I submitted this answer. Instead of using factories, I now often inject the data context itself, and register it on a per (web) request basis. However; a shift in how you need to design your application might be needed, so as always: it depends. Please take a look at <a href="https://stackoverflow.com/a/10588594/264697">this answer</a>.</p>
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    1. COI love the principle of least surprise! Great answer, I like the thinking and the pattern. I will test to see if it solves my issue, if it does, you'll get the biscuit. For now, +1.
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    2. CObtw. Unscientific research as proven that 86.3% of all problems about IoC containers can be solved by using factories :-)
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    3. COWorked a dream. Neatly separated concerns. The parameters under my control. Minimal Dependency Injection required. My knowledge expanded incrementally rather than dramatically. Surprise is minimized. I move on. Merry Christmas.
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