The County has a web-based vendor registration system on its E-purchasing website. Vendors must self-register, and registration is free. The County encourages vendors to participate in county solicitation opportunities. However, it is the vendors' responsibility to keep their registration current and it is their responsibility to modify their registration online whenever any changes occur in their commodities or service, address, ownership, or status as a prospective bidder. Failure to respond to a formal solicitation is defined as a lack of response when invited to bid. The County reserves the right to update and validate the bidders' list periodically and may require renewal of applications on file.