  We present results of anisotropic thermal expansion and low temperature
magnetostriction measurements on YNi$_2$B$_2$C single crystals grown by high
temperature flux and floating zone techniques. Quantum oscillations of
magnetostriction were observed at low temperatures for $H \| c$ starting at
fields significantly below $H_{c2}$ ($H < 0.7 H_{c2}$). Large irreversible,
longitudinal magnetostriction was seen in both, in-plane and along the c-axis,
directions of the applied magnetic field in the intermediate superconducting
state. Anisotropic uniaxial pressure dependencies of $T_c$ were evaluated using
results of zero field, thermal expansion measurements.
