Add string with List to a multiline textbox
<p>I'm trying to add a <code>list</code> and a <code>string</code> in a <code>textbox</code> with this code</p>

<pre><code>ilaninfotextbox.Text = string.Join(Environment.NewLine, ilantextinner, combinelist);
</code></pre>

<p><code>ilantextinner</code> is a <code>string</code> and shows correctly on the textbox</p>

<p><code>ilantextinner</code> is a <code>List&lt;string&gt;</code> with 20 lines in it</p>

<p>But <code>ilantextinner</code> list is showing like this in the textbox:</p>

<pre><code>System.Collections.Generic.List`1[System.String]
</code></pre>

<p>How can I show the contents of <code>ilantextinner</code> in the textbox?</p>

<p>Note: If I use only <code>ilantextinner</code> contents are shown correctly.</p>