C#

 string[] files = Directory.GetFiles(C:\temp\09_20_2012\CUSTOMER1, "*summ.xls",SearchOption.AllDirectories);
 
string[] files = Directory.GetFiles("C:\\temp", "*summ.xls", SearchOption.AllDirectories);

Thus for like the statement,
 "string[] files = Directory.GetFiles("C:\\temp", "*summ.xls", SearchOption.AllDirectories);",

public void SelectNodeByEntity<T>(T Entity)
{
    UltraTreeNode node = GetNode(UltraTree1.Nodes, Entity);

    if (node != null)
    {
        UltraTree1.ActiveNode = node;
    }
}
private UltraTreeNode GetNode<T>(TreeNodesCollection Nodes, T Entity)
{
    UltraTreeNode retVal = null;

    foreach (UltraTreeNode node in Nodes)
    { 
        var entity = (T)node.Tag;

        if (entity == Entity)    //<====== Doesn't compile.
        {
            return node;
        }
        else
        {
            if (node.Nodes.Count > 0)
            {
                return GetNode<T>(node.Nodes, Entity);
            }
        }
    }

    return retVal;
}