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Delay-dependent robust stochastic stabilization and Hinfin control problems for a class of networked control systems (NCSs) with data packet dropout and delays are investigated. Based on Lyapunov stability theory combined with linear matrix inequalities (LMIs) techniques, some new delay-dependent criteria in terms of LMIs are derived by introducing some free weighting matrices which can be chosen properly to lead to much less conservative results. The Hinfin controller with disturbance attenuation level to guarantee the stability of the systems can be obtained effectively by solving a set of LMIs. Numerical examples are given to illustrate the effectiveness of the proposed methods and an improvement over some existing results.