Fires on the server side after the page size (number of items per page) is changed by end-user interactions.
The PageSizeChanged event's data class is EventArgs.
Page size, i.e., the maximum number of items that can be displayed on a page, is specified by the ASPxPagerBase.ItemsPerPage property.
The PageSizeChanged event allows you to perform any custom actions after the page size is changed by end-user interactions. Before the page size is changed, the ASPxPagerBase.PageSizeChanging event is raised, allowing you to cancel the action.
When a control displays all items, the ASPxPagerBase.ItemsPerPage property returns the last specified numerical value.