ListView.ListViewItemCollection.Add Method (ListViewItem)
Adds an existing ListViewItem to the collection.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
You can use this version of the Add method to add an existing ListViewItem to the collection. This version of the Add method is typically used to reuse items from other ListView controls or if the ListViewItem was created manually before adding it to the collection. If you want to create a new ListViewItem instead of using an existing item, use the other versions of the Add method.
If the ListView.Sorting property is set to a value other than SortOrder.None or if the ListViewItemSorter property is set, the list is sorted after the item is added. Otherwise, the item is inserted at the end of the list. If the list is not sorted, you can use the Insert method to insert an item into the ListView at a specific position. To add a set of items to the control in a single operation, use the AddRange method. If you want to use the Add method to add a large number of items to the control, use the BeginUpdate and EndUpdate methods to prevent the ListView from repainting until all items are added. When adding items to a ListView, it is more efficient to sort the items first and then add new items.