Deleting items in object-model

How to add a new item to SharePoint list in server object-model using C#.

This is my code and I want to delete items using listBox

    SPWeb web = SPContext.Current.Web;
    SPListItemCollection booksListaItems = web.Lists["Books"].GetItems();
    foreach(SPListItem item in booksListaItems)
    {
        lstItems.Items.Add(item.GetFormattedValue("Title"));
    }