Collection was modified; enumeration may not execute error when removing a ListItem from a LIstBox

Question

I have two ListBoxes, lstAvailableColors and lstSelectedColors. Between each listbox are two buttons, Add and Remove. When a color or colors is selected in lstAvailableCol

Answer 1

This might help you;

To Remove:

protected void btnRemove_Click(object sender, EventArgs e)
{
    {
        for (int i = 0; i < lstAvailableColors.Items.Count; i++)
        { 
            if(lstAvailableColors.Items[i].Selected)
                lstAvailableColors.Items.RemoveAt(i);
        }
    }
}