Fast 3D arrays in .Net

DataCube.cs

public class DataCube<T> {

	public DataCube(int width, int height, int depth){
		this.width = width;
		this.height = height;
		this.depth = depth;
		size3d = width*height*depth;
		size2d = width*height;
		data = new T[size3d];
	}
	private T[] data;
	private int width;
	private int height;
	private int depth;
	private int size3d;
	private int size2d;
	
	public T this[int x, int y, int z]{
		get { return data[index(x,y,z)]; }
		set { data[index(x,y,z)] = value; }
	}
	private int index(int x, int y, int z){
		return x + y * width + z * size2d;
	}
}