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We measure the branching fraction and the \CP-violating asymmetry of
$B^{0}\to K_{s}^{0}\pi^{0}$ decays with $227$ million $\Upsilon(4S)\to
B\bar{B}$ events collected with the BaBar detector at the PEP-II
asymmetric-energy $e^+e^-$ collider at SLAC. We obtain a branching
fraction ${\cal B}(B^{0}\to K^{0}\pi^{0}) = (11.4 \pm 0.9 \pm 0.6)
\times 10^{-6}$ and $CP$-violating asymmetry parameters
$C_{K_{s}^{0}\pi^{0}} = 0.06 \pm 0.18 \pm 0.03$ and
$S_{K_{s}^{0}\pi^{0}} = 0.35^{+0.30}_{-0.33} \pm 0.04$, where the
first error is statistical and the second systematic.
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