Teacher

class Program
{
    static void Main(string[] args)
    {
        List<XElement> elements = GetElementsFromFile(@"ConsoleApplication35.exe.config");
        foreach (var item in elements)
        {
            Console.WriteLine(item.Name);
        }
        Console.ReadKey();
    }

    public static List<XElement> GetElementsFromFile(string p_fileName)
    {
        List<XElement> list = new List<XElement>();
        BuildElementList(XElement.Load(p_fileName).Elements(), list);
        return list;
    }

    private static void BuildElementList(IEnumerable<XElement> p_elements, List<XElement> p_list)
    {
        foreach (var item in p_elements)
        {
            p_list.Add(item);
            var children = item.Elements();
            if (children.Any())
            {
                BuildElementList(children, p_list);
            }
        }
    }
}