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    <p>The <code>Console.ReadKey()</code> method locks the <code>Console.InternalSyncObject</code> whereas the <code>Console.ReadLine()</code> method does not. When the <code>TimerCallBack()</code> method tries to write to the <code>Console</code> the <code>Thread</code> waits because the <code>Console.InternalSyncObject</code> is still locked. Therefore <code>GC.Collect()</code> is never called. As soon as you hit a key the lock is released and <code>GC.Collect()</code> is called.</p> <p>I changed your code to the following which doesn't lock the <code>Console.InternalSyncObject</code> and it only beeps once in Release and every 2 seconds in Debug.</p> <pre><code>private static void TimerCallback(Object o) { Console.Beep(); GC.Collect(); } </code></pre> <p>The reason the Console.WriteLine() waits is because it tries to acquire a lock on the <code>Console.InternalSyncObject</code> when creating the <code>Console.Out</code> <code>TextWriter</code> for the first time. </p> <p>Changing your code to the following works as expected as we create the <code>Console.Out</code> <code>TextWriter</code> before starting the timer.</p> <pre><code>public static void Main() { Console.WriteLine("Loaded"); Timer t = new Timer(TimerCallback, null, 0, 2000); Console.ReadKey(); } private static void TimerCallback(Object o) { Console.WriteLine("In TimerCallback: " + DateTime.Now); GC.Collect(); } </code></pre> <p>This is due to a change in .NET 4.5. More info <a href="http://blogs.microsoft.co.il/blogs/dorony/archive/2012/09/12/console-readkey-net-4-5-changes-may-deadlock-your-system.aspx" rel="noreferrer">here</a></p>
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    1. CO+1, informative!
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    2. COI noticed that adding a Console.WriteLine before creating the timer also fixes the behavior. It has something to do with Read locking the Stream so you can't create a Write.
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      1. USWouter de Kort
    3. COJust added more info as you were commenting. I found the Console attempts to acquire a lock when creating the Out TextWriter for the first time
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