ArgumentOutOfRangeException for ListViewItem when clicking 2nd time

Question

The method below when I click second time gives the ArgumentOutOfRangeException error, and says index 0 is not a valid index.

In first click it works!?

ListView

Answer 1

You are getting an error because your first if statement will never evalute to true (and return) since count will never go below 0. Due to this, even if your list is empty it still tries to delete the first element, throwing an ArgumentOutOfRangeException.

Your if statement should instead check if it is equal to 0, as such:

 if (li.SelectedItems.Count == 0)

Nothing happens when you press anything except Alt/Control because you are not handling the event for any key press other than those,

 Control.ModifierKeys == Keys.None

Means that no keys are pressed as opposed to anything except Alt/Control being pressed.