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copied!<p>As Joe pointed out, culture is transferred by the <code>HttpContext</code> in ASP.NET. The way ASP.NET does this is by installing a <code>SynchronizationContext</code> when a request starts, and that context is also used to resume asynchronous methods (by default).</p> <p>So, there are a couple of ways to approach the problem: you can either write your own <code>SynchronizationContext</code> that will preserve culture by default, or you can explicitly preserve the culture across each <code>await</code>.</p> <p>To preserve the culture at each <code>await</code>, you can use code <a href="http://blogs.msdn.com/b/pfxteam/archive/2011/01/13/10115642.aspx">from Stephen Toub</a>:</p> <pre><code>public static CultureAwaiter WithCulture(this Task task) { return new CultureAwaiter(task); } public class CultureAwaiter : INotifyCompletion { private readonly TaskAwaiter m_awaiter; private CultureInfo m_culture; public CultureAwaiter(Task task) { if (task == null) throw new ArgumentNullException("task"); m_awaiter = task.GetAwaiter(); } public CultureAwaiter GetAwaiter() { return this; } public bool IsCompleted { get { return m_awaiter.IsCompleted; } } public void OnCompleted(Action continuation) { m_culture = Thread.CurrentThread.CurentCulture; m_awaiter.OnCompleted(continuation); } public void GetResult() { Thread.CurrentThread.CurrentCulture = m_culture; m_awaiter.GetResult(); } } </code></pre> <p>The <code>SynchronizationContext</code> approach is more complicated but once it's set up, it will be easier to use. I don't know of a good example of an ASP.NET-like context, but a good starting point is <a href="http://msdn.microsoft.com/en-us/magazine/gg598924.aspx">my MSDN article</a>.</p>

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