ShellControlConnectorFolderChanging Event

public event EventHandler<FolderChangingEventArgs> FolderChanging

Public Event FolderChanging As EventHandler(Of FolderChangingEventArgs)

public:
 event EventHandler<FolderChangingEventArgs^>^ FolderChanging {
	void add (EventHandler<FolderChangingEventArgs^>^ value);
	void remove (EventHandler<FolderChangingEventArgs^>^ value);
}

member FolderChanging : IEvent<EventHandler<FolderChangingEventArgs>,
    FolderChangingEventArgs>

private ItemIdList m_RootItemIdList; //stores the ItemIdList of the allowed folder 
private void ShellControlConnector1_FolderChanging(object sender, FolderChangingEventArgs e)
{
    if (ItemIdList.IsNullOrInvalid(m_RootItemIdList))
        return;

    //We also want to allow the view, where the search result is presented and also subfolders from the search result.
    if (e.FolderIdList.IsSearchFolder || e.FolderIdList.IsInSearchFolder)
        return;
    //Else, only children of the stored root are allowed (and the root itself).
    e.Cancel = !(m_RootItemIdList.IsParentOf(e.FolderIdList));
}