void Item_BeforeNameChange(object sender, NameChangeEventArgs e)
{
if (e.NewName != e.OldName)
{
if (_NameDict.ContainsKey(e.NewName))
{
throw new ArgumentException("Cant the the name of the INamedItem from {0} to {1}, because the new name does already exist in a colelction to which this object is assigned.".Build(e.OldName, e.NewName));
}
}
}
void Item_AfterNameChanged(object sender, NameChangeEventArgs e)
{
_NameDict.Remove(e.OldName);
_NameDict.Add(e.NewName, (T)sender);
}