Is it possible to set Obsolete attribute to existing method using extension method
<pre><code>My Team use ---&gt;     aa.GetItem()       --&gt;&gt; result
</code></pre>

<p>After create <code>NewGetItem</code> extension function. don't use <code>GetItem</code>. <code>GetItem</code> must be <code>obsolete</code></p>

<pre><code>My Team use ---&gt; ┒    aa.GetItem()       ┌ --&gt;&gt; new result
                 │                       │
                 └--&gt; aa.NewGetItem() --&gt;┘
</code></pre>

<p>i don't have <code>aa</code> class code. </p>

<p>How to do it?</p>

<p>Is it possible?</p>
