Question

i have a listbox and i would want to display a label displaying:

scrolling through items XXX to XYY of ZZZ.

how do I do this because using SelectedIndex will not be useful, as i would like the label to update even when nothing is selected. (scrolling too, it does not select an item).

update:
for example I have 200 items in my listbox. at any one time i can only display only 10 items because of my listbox’s height. so the label should read:

displaying items 1 to 10 of 200

or

displaying items 5 to 15 of 200

however i must take into account that there may not be any indices selected because i can simply scroll and not select anything.

Answer 1

You can get the top index value using listbox.TopIndex and the count using listbox.Items.Count but I can’t see any way to get the bottom item withotu calculating it from the result of listbox.GetItemHeight() and listbox.ClientSize.Height:

int visibleCount = listBox1.ClientSize.Height / listBox1.ItemHeight;
this.Text = string.Format("{0:d} to {1:d} of {2:d}", listBox1.TopIndex + 1, listBox1.TopIndex + visibleCount, listBox1.Items.Count);

This can be done on a timer as I see no scroll event.