From the information you provided, you did violate the conditions of your B1/B2 visa in that you overstayed your authorized period to stay and you you sought public assistance. However, that fact alone will not necessarily preclude you from seeking admission into the US in the future. Regarding the conversion of your B1/B2 visa to a H1B visa, well I would require and any other immigration attorney would necessitate additional information as to why you believe you may be eligible for a H1B visa. The H1B process is very different than seeking a vistor visa. I would urge you to contact an immigration lawyer.
Answered on Jul 13th, 2012 at 2:23 PM