List.Capacity does not working : <p>List.Capacity does not working </p>

<p>Code</p>

<pre><code> var xx = new List&lt;int&gt;();    
 xx.Add(1);
 int xxxx = xx.Capacity;// result is 4 and change to 8,12,16 while adding new item to xx list. 
</code></pre>

<p>But the capacity is does not working, which mean does not increasing while set the capacity manually </p>

<pre><code> var xx = new List&lt;int&gt;(1); // or xx.Capacity = 1;   
 xx.Add(1);
 int xxxx = xx.Capacity;// result is always showing 1 does not increasing like 5, 9, 13...
</code></pre>
