Contract

EXHIBIT 1 — JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them a Statement on Schedule 13D (including amendments thereto) with regard to the Common stock, $0.01 par value, of Dynamex Inc. and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filings. In evidence thereof, the undersigned, being duly authorized, hereby execute this Agreement as of October 4, 2010.

	LKCM Private Discipline Master Fund, SPC
	By:	LKCM Private Discipline Management, L.P., sole holder of its management shares
	By:	LKCM Alternative Management, LLC, its general partner
	By:   LKCM Capital Group, LLC, its sole member
	By:	/s/ J. Xxxxx Xxxx
		J. Xxxxx Xxxx, President
	LKCM Investment Partnership, L.P.
	By:	LKCM Investment Partnership GP, LLC, its general partner
	By:	/s/ J. Xxxxxx Xxxx, Xx.
		J. Xxxxxx Xxxx, Xx., President
	LKCM Investment Partnership II, L.P.
	By:	LKCM Investment Partnership GP, LLC, its general partner
	By:	/s/ J. Xxxxxx Xxxx, Xx.
		J. Xxxxxx Xxxx, Xx., President
	LKCM Capital Group, LLC
	By:	/s/ J. Xxxxx Xxxx
		J. Xxxxx Xxxx, President
	LKCM Investment Partnership GP, LLC
	By:	/s/ J. Xxxxxx Xxxx, Xx.
		J. Xxxxxx Xxxx, Xx., President
	Xxxxxx Xxxx Capital Management Corporation
	By:	/s/ J. Xxxxx Xxxx
		J. Xxxxx Xxxx, Vice President
	/s/ J. Xxxxx Xxxx
	J. Xxxxx Xxxx
	/s/ J. Xxxxxx Xxxx, Xx.
	J. Xxxxxx Xxxx, Xx.