Problem to save contact item in subfolder programmatically

[MAFr]

I try to save ContactItem in Contacts subfolder but can't (C#). It always
saves it in root contacts although I tried to navigate through Folders
collection, or activate subfolder through explorer, or whatever I could
imagine. Nothing helped.

Moreover, in MS VB help for ContactItem's save method I found:
"Saves the Outlook item to the current folder or, if this is a new item, to
the Outlook default folder for the item type."

which might be interpreted as forceful saving in Contacts folder (or may be
subfolder could be set as default one but I don't know how).

Does somebody know if there is the way to save in subfolder. Help will be
appreciated.

Thanks in advance.