Delete selected items from listbox

Question

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"); 

Answer 1

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.