System Linq Enumerable error while using intersect : <p>I have 3 lists and I'm trying to display their common items in a text box, and while I am implementing the method</p>

<pre><code>var result = l1.Intersect(l2);                
textBox1.Text = "";
textBox1.Text = result.ToString();  
</code></pre>

<p>while l1 is my first list and l2 is my second list
I get the error:</p>

<blockquote>
  <p>System.Linq.Enumerable+d__70`1[System.String]</p>
</blockquote>

<p>any help would be appreciated.</p>
