Show/hide (plot) pushpins based on Map zoom level/view

Question

Hi,

We have requirement to show pushpin based zoom level/view.

Is there a way to limit the number of existing Pushpin displayed on a Bing Map depending on the zoom level? Like at level 5 only show one Pushpin and on a higher zoom level increase the amount displayed, so that at level 15 all existing Pushpin are shown. Is there any sample code for this.

Do we need to fetch all pushpin and then show based on zoom level or fetch only pushpin that are within zoom level/view.

Thanks!