https://learn.microsoft.com/en-us/dotnet/api/system.directoryservices.accountmanagement.authenticableprincipal.changepassword?view=netframework-4.8.1&viewFallbackFrom=dotnet-plat-ext-6.0&WT.mc_id=DOP-MVP-37580
AuthenticablePrincipal.ChangePassword(String, String) Method...
Changes the account password from the old password to the new password. Do not use this with a ComputerPrincipal.
changepasswordstringmethod