The user can select or unselect rows by clicking checkboxes.

Pressing Shift and clicking the mouse or pressing Shift and one of the arrow keys (Up Arrow, Down Arrow, Left Arrow, or Right Arrow) extends the selection from the previously selected item to the current item. Pressing Ctrl and clicking the mouse selects or deselects an item in the list. Since selected rows do not have to be adjacent, the user can also operate the vertical scroll bar to bring other rows into view if desired.

If the user clicks a row, that row is selected, and the SelectedIndex property returns a bookmark for that row.
If more than one row is selected, the SelectedIndex property returns the bookmark of the most recently selected row, and the SelectedIndices collection contains the bookmarks for all selected rows. The user can also unselect a row.

The user cannot select rows.

Only one item in the list can be selected.