Sec.[Section] 1. Be it enacted by the people of the state of Illinois represented in the General Assembly. That the Clerk of the county commissioners Court of Dupage county be and he is hereby authorized and permitted to keep his office as such Clerk at the place where said office is now kept, any law to the contrary notwithstanding. Provided this act shall not be so construed as to authorize the said clerk to make any charge against said county for office rent, and provided further this act shall not continue in force until the first day of January one thousand eight hundred and forty three.