Question

After adding items this way:

for (int x = 1; x <= 50; x++)
   {
      listBox1.Items.Add("Item " + x.ToString());
   }

I’m wondering how I can update their name later when changes are made. In the code. Let’s suppose I want to change the name of the item at index 5, how do I do that?

Obviously something like that won’t work:

listBox1.Items[5].???? = "new string";

Answer 1

You should be able to use the following:

private void UpdateListBoxItem(ListBox lb, object item) {
        int index = lb.Items.IndexOf(item);
        int currIndex = lb.SelectedIndex;
        lb.BeginUpdate();
        try {
            lb.ClearSelected();
            lb.Items[index] = item;
            lb.SelectedIndex = currIndex;
        }
        finally {
            lb.EndUpdate();
        }
    }

And this is the usage:

MyObject item = (MyObject)myListBox.Items[0];
item.Text = "New value";
UpdateListBoxItem(myListBox, item);