Adding items in server object-model

How to add a new item to SharePoint list in server object-model from using C# this is my code and i want to add items using textboxes

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