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copied!<p>Without seeing your code, the short answer is that EntityFramework is not thread-safe. You're getting this error in a seemingly random pattern when two+ threads overlap when trying to try access your <code>ObjectContext</code>. I assume you've stuffed your context into a <code>static</code> variable. Either make the context a local variable or write locking around access to the <code>ObjectContext</code>.</p> <p>If you want a more specific answer posting your code will help.</p> <p><strong>Edit</strong></p> <p>Your issue is that two threads are trying to use the context at the same time, or 1 thread is leaving a transaction open then and a second thread comes through trying to use your singleton context. Your code snippet raises more questions for me than I had before. </p> <ul> <li>In your code example is _<code>lockObject</code> a static variable? </li> <li>Why do you show the lock in <code>SaveChanges</code> but then explain an error is being thrown from <code>InsertOrUpdateDetachedObject</code>? Can we see the code for <code>InsertOrUpdateDetachedObject</code>?</li> <li>Does SaveChanges use the same <code>_lockObject</code> as all other methods that access the context directly?</li> <li>Is your call to <code>_context.SaveChanges</code> the only way you save to the DB or do you have other areas that open transaction contexts on their own? </li> <li>Your using a singleton so your context is shared across multiple calls. It might be preferable to instantiate a new new context for every WFC call.</li> </ul>

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