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    <p>I had the same problem but my issue with the @Slauma's solution (although great in certain instances) is that it recommends that I pass the context into the service which implies that the context is available from my controller. It also forces tight coupling between my controller and service layers. </p> <p>I'm using Dependency Injection to inject the service/repository layers into the controller and as such do not have access to the context from the controller. </p> <p>My solution was to have the service/repository layers use the same instance of the context - Singleton. </p> <p><strong>Context Singleton Class:</strong> </p> <p>Reference: <a href="http://msdn.microsoft.com/en-us/library/ff650316.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/ff650316.aspx</a><br> and <a href="http://csharpindepth.com/Articles/General/Singleton.aspx" rel="nofollow">http://csharpindepth.com/Articles/General/Singleton.aspx</a></p> <pre><code>public sealed class MyModelDbContextSingleton { private static readonly MyModelDbContext instance = new MyModelDbContext(); static MyModelDbContextSingleton() { } private MyModelDbContextSingleton() { } public static MyModelDbContext Instance { get { return instance; } } } </code></pre> <p><strong>Repository Class:</strong></p> <pre><code>public class ProjectRepository : IProjectRepository { MyModelDbContext context = MyModelDbContextSingleton.Instance; </code></pre> <p>Other solutions do exist such as instantiating the context once and passing it into the constructors of your service/repository layers or another I read about which is implementing the Unit of Work pattern. I'm sure there are more...</p>
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    1. POentity object cannot be referenced by multiple instances of IEntityChangeTracker. while adding related objects to entity in Entity Framework 4.1
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    1. USkmullings
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    1. CO...doesn't this break down as soon as you try and use multithreading?
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    2. COA context should not remain open any longer than necessary, using a Singleton to keep it open forever is the very last thing you want to do.
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    3. COI have seen good implementations of this per request. Using the Static keyword is wrong but if you make this pattern to instantiate the context at the beginning of the request and dispose it at the end of request, it would be a legit solution.
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