Multidimensional arrays x,y,z length

How can I reference a multidimensional arrays lengths? I have a boolean[,] and I want to reference the different lengths.

Use GetLength():

#pragma strict

var arbool : boolean[,,]  = new boolean[10,20,30];

function Start() {
    Debug.Log(arbool.GetLength(0)+","+arbool.GetLength(1)+","+arbool.GetLength(2));
}