Delete selected items from listbox

c#, listbox

Solution

You can't modify a collection while iterating (using a `foreach`) through it. Instead use a reverse `for` loop:

ListBox.SelectedObjectCollection selectedItems = new ListBox.SelectedObjectCollection(lstClientes);
selectedItems = lstClientes.SelectedItems;

if (lstClientes.SelectedIndex != -1)
{ 
    for (int i = selectedItems.Count - 1; i >= 0; i--)
        lstClientes.Items.Remove(selectedItems[i]);
}
else
    MessageBox.Show("Debe seleccionar un email");

Using a reverse loop ensures you don't skip over any after removing them.

Problem

I want to do that but, the listbox changes on every deletion, so it throws runtime exception even if I tried to do a new object. I tried like this: ``` ListBox.SelectedObjectCollection selectedItems = new ListBox.SelectedObjectCollection(lstClientes); selectedItems = lstClientes.SelectedItems; if (lstClientes.SelectedIndex != -1) { foreach (string s in selectedItems) lstClientes.Items.Remove(s); } else MessageBox.Show("Debe seleccionar un email"); ```

Original source