Remove null from list string c#
<p>Seems it was answered a few times already but it's not working for me...</p>

<p>I have a list  called combox. I want to remove null items.</p>

<p>I wrote:</p>

<pre><code>   List&lt;String&gt; comboxTable = new List&lt;string&gt;();  
    comboxTable = comboxTable.RemoveAll(item =&gt; item == null);
</code></pre>

<p>but I'm getting:</p>

<blockquote>
  <p>Error 14  Cannot implicitly convert type 'int' to
  'System.Collections.Generic.List'</p>
</blockquote>

<p>I tried this one: </p>

<pre><code>comboxTable = comboxTable.RemoveAll(string.IsNullOrWhiteSpace);
</code></pre>

<p>Same error.
Where is the 'int'?
What am I doing wrong?</p>

<p>(Combox is getting its string value someplace else in the code and has Nulls here and there. I want to delete them)</p>