public static void LoadExpenses(TreeListView lView, string xFile)
{
Throw.IfFalse(File.Exists(xFile), new FileNotFoundException(xFile));
InitializeListView(lView);
var xDoc = XDocument.Load(xFile);
Debug.Assert(xDoc.Root.Name == "Expenses");
Debug.Assert(xDoc.Root.Attributes().Count() >= 2);
var xList = new List <XElement>(xDoc.Root.Elements());
var lItems = PrepareTree(xList, null);
foreach (var li in lItems)
{
lView.AddItem(li);
}
}