> For the complete documentation index, see [llms.txt](https://docs.wisej.com/migration/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wisej.com/migration/winforms-to-wisej-1/optimizations-after-migration/virtualscroll.md).

# VirtualScroll

in Wisej.NET TreeViews, ComboBoxes, ListBoxes, ListViews, DataGridViews and DataRepeaters support [virtual scrolling](https://docs.wisej.com/docs/controls/lists/combobox#virtual-scrolling) allowing these controls to handle an **unlimited number of items**, while only the visible items are rendered.\
This offers a very good user experience even for ComboBoxes with more than 100.000 items.

You can control the behavior when scrolling by setting the [PrefetchItem ](https://docs.wisej.com/docs/releases/whats-new-in-2.1#virtual-prefetch)property.<br>