Change password programmically by WMI

[goodstas]

Hi.
I work with Windows 2003 Server R2 , SP2.
I need to write the tool which 'knows' to change password to the specified user.
My computers are in WORKGROUP.
I would like to get examples how to do it.
I tryed to do it with NetUserChangePassword bud it was not succeded (Error code = 1327).
I know there is a way to use WMI. But i didn't find good example.

Thanks a lot.

P.S.: it must be C# code.