Pastable version of Find the list's last satisfying element and skip the rest

<pre class='prettyprint' language='cs'>using System;
using System.Collections.Generic;
using System.Linq;

public class DevicePosition
{
	// stub
	public DateTime Time;
}

public class Foo
{
	// this should be IEnumerable.
	private IEnumerator&lt;DevicePosition&gt; ValidPositions()
	{
		// stub
		return null;
	}

public bool FindRecentRepresentatives(
		int milliseconds,
		out DevicePosition current,
		out DevicePosition previous)
	{
		if (milliseconds &lt;= 0) {
			throw new ArgumentOutOfRangeException (&quot;milliseconds&quot;);
		}

current = null;
		previous = null;

IEnumerator&lt;DevicePosition&gt; valids = ValidPositions ();
		valids.MoveNext ();
		current = valids.Current;

if (current != null) {
			long minTime = current.Time.Ticks - TimeSpan.FromMilliseconds (milliseconds).Ticks;

// this is the difficult part:
			while (valids.MoveNext ()) {
				if (valids.Current.Time.Ticks &lt; minTime) {
					break;
				}
				previous = valids.Current;
			}
		}
		return (current != null) &amp;&amp; (previous != null);
	}
}</pre>
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Pastable version of Find the list's last satisfying element and skip the rest