VirtualScroll

in Wisej.NET TreeViews, ComboBoxes, ListBoxes, ListViews, DataGridViews and DataRepeaters support 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 property.