protected virtual void InsertSample(string sp)
{
LinkedListNode <string> node = Samples.First;
do
{
if (node == null)
{
node = Samples.AddFirst(sp);
break;
}
else if (node.Value.CompareTo(sp) > 0)
{
node = Samples.AddBefore(node, sp);
break;
}
node = node.Next;
} while (node != null);
if (node == null)
{
node = Samples.AddLast(sp);
}
}