The MultiSelectListBox control is an advance ListBox control which supports checkboxes for each item, options for selecting all items and filtering items .
This sample exposes the list of checked items through the checkedItems property.
This sample also set the selection at the item in the middle of view by using SelectedIndex property.
When the filter input is shown, using the Delay property in milliseconds set the delay between when a keystroke occurs and when the search is performed to update the filter.
Using CaseSensitiveSearch determines whether searches performed while the user types should case-sensitive.