split a list using linq
<p>I've the following code:</p>

<pre><code>  var e = someList.GetEnumerator();
  var a = new List&lt;Foo&gt;();
  var b = new List&lt;Foo&gt;();
  while(e.MoveNext())  {
     if(CheckCondition(e.Current)) {
         b.Add(e.Current);
         break;
     }
     a.Add(e.Current);
 }

while(e.MoveNext())
  b.Add(e.Current)
</code></pre>

<p>This looks ugly.  Basically, iterate through a list and add elements to one list until some condition kicks in, and add the rest to another list. </p>

<p>Is there a better way e.g. using linq ? CheckCondition() is expensive, and the lists can be huge so I'd prefer to not do anything that iterates the lists twice.</p>
