resistance of capacitor?

By the term "resistance", we normally refer to d.c. (direct current) resistance in physics.
Resistance R is defined using Ohm's Law, i.e. the ratio of voltage across a component V to the current I passing through the same component.
i.e. R = V/I
For a charged capacitor, V is a finite value, but I is zero. Hence R becomes infinte. Thus all capacitors can be regarded to have infinite d.c. resistance irrespective to their capacitances. In other words, a capcitor acts like an "open point" in a circuit.