CERN-LHC. The t t-bar charge asymmetry in proton-proton collisions at sqrt(s) = 7 TeV is measured using the dilepton decay channel (E+ E-, E+- MU-+ or MU+ MU-). The data correspond to a total integrated luminosity of 5.0 inverse-femtobarns, collected by the CMS experiment at the LHC. The top-antitop and lepton charge asymmetries, ASYMC and ASYMC(LEPTON), defined as the differences in absolute values of the rapidities between the reconstructed top quarks and antiquarks and of the pseudorapidities between the positive and negative leptons, respectively, are presented. The lepton charge asymmetry is also measured as a function of the invariant mass, M(TOP TOPBAR), rapidity, YRAP(TOP TOPBAR), and transverse momentum, PT(TOP TOPBAR), of the top-antitop system.