Action<T> is different event Action<T>?
<pre><code>public class TestA
{
    public event Action&lt;int&gt; updateEvent;
    ...
    if(updateEvent != null)
    {
        Actin&lt;int&gt; tempEvent = updateEvent;
        updateEvent(1);
    }
}

public class TestB
{
    public Action&lt;int&gt; updateEvent;
    ...
    if(updateEvent != null)
    {
        Actin&lt;int&gt; tempEvent = updateEvent;
        updateEvent(1);
    }
}
</code></pre>

<p>however <code>event Action&lt;T&gt;</code> is eventQueue au</p>

<p>use same and resutl same. What is more good? (i like TestB. Because simple using.)</p>
