  We discuss W boson and lepton charge asymmetry measurements from W decays in
the electron channel, which were made using 9.7 fb$^{-1}$ of RunII data
collected by the D0 detector at the Fermilab Tevatron Collider. The electron
charge asymmetry is presented as a function of pseudo-rapidity out to |$\eta$|
$\le$ 3.2, in five symmetric and asymmetric kinematic bins of electron
transverse momentum and the missing transverse energy of the event. We also
give the W charge asymmetry as a function of W boson rapidity. The asymmetries
are compared with next-to-leading order perturbative quantum chromodynamics
calculations. These charge asymmetry measurements will allow more accurate
determinations of the proton parton distribution functions and are the most
precise to date.
