A director should submit a written resignation letter that notes the effective date of their departure. Formation of Business Entities and Nonprofit Corporations Under the Texas Business Organizations Code: Online filing available through SOSDirect.Send your letter certified mail or ask for an email receipt if you are sending your resignation electronically. The Dallas County Administrative Code contains the employment policies and procedures for Dallas County. Under the Texas Education Code, contract employees are required to resign no later than 45 days before the first day of instruction for the school year. Prepare a written, dated, signed resignation letter that indicates the effective date of your resignation. Applicants to fill vacant positions in the county. The Chapter strives to: a. The board will then need to formally accept the resignation at a board meeting. The formal acceptance should be documented in the meeting minutes.