We present measurements of the forward-backward asymmetry in Drell-Yan dilepton ($ee$ and $\mu\mu$) events with the data sample of pp collisions at $\sqrt{s}$ = 7 TeV and 8 TeV collected by ATLAS and CMS detector. At CMS, the measurements are extended up to the boson rapidity, $|y|$=5, by including forward electrons. At ATLAS, the measured forward-backward asymmetry is used to extract the effective electroweak mixing angle, $\sin^{2}\theta_{eff}^{lept}$. The measured $\sin^{2}\theta_{eff}^{lept}$ from combining all channels is 0.2308 $\pm$ 0.0005(stat.) $\pm$ 0.0006(syst.) $\pm$ 0.0009(PDF).