Importing XML to List C#

I have a Problem using Linq and Lists...

I have this code:

class CalendarItemList : System.Collections.Generic.List<CalendarItem>
{
    public void Load(string FileName)
    {
        XDocument xdoc = XDocument.Load(FileName);

        Console.WriteLine("Dokument geladen...");

        foreach (XElement xEl in xdoc.Root.Elements())
        {
            this.Add(new CalendarItem(xEl));
        }
    }
}

And this other Class:

namespace XMLDeserialize
{
    [Serializable]
    public class CalendarItem : List<CalendarItemList>
    {

        //Here is the Point where the List should be filled with all my XElements

        public CalendarItem(XElement xEl)
        {
            foreach (XElement xElChild in xEl.Elements())
            {
                        initFromElement(xEl);
            }
    }

    private void initFromElement(System.Xml.Linq.XElement x)
    {

        if (x.Name == "Value")
        {
            m_Value = x.Value;
            return;
        }
        if (x.Name == "Key")
        {
            int.TryParse(x.Value, out m_Key);
            return;
        }
    }

But yet I didn't got my XML File entries in my List. Could you please help me?