Add Windows users with code dynamics

public void AddSysUser (string domain, string UserName, string UserPwd) {DirectoryEntry deObj = null; try {deObj = new DirectoryEntry ( "WinNT: //" domain); DirectoryEntries deCnt = deObj.Children; DirectoryEntry objUser = deCnt.Add ( Username, "user"); objuser.properties ["fullname"]. Add ("sttest"); objuser.invoke ("setpassword", userpwd); objuser.commitchanges ();} catch {throw;}

}