System.Windows.Forms.ListView.ListViewItemCollection.AddItem C# (CSharp) Method

			void AddItem (ListViewItem value)
			{
				if (list.Contains (value))
					throw new ArgumentException ("An item cannot be added more than once. To add an item again, you need to clone it.", "value");

				if (value.ListView != null && value.ListView != owner)
					throw new ArgumentException ("Cannot add or insert the item '" + value.Text + "' in more than one place. You must first remove it from its current location or clone it.", "value");
				if (is_main_collection)
					value.Owner = owner;
				else {
					if (value.Group != null)
						value.Group.Items.Remove (value);

					value.SetGroup (group);
				}

				list.Add (value);

				// force an update of the selected info if the new item is selected.
				if (value.Selected)
					value.SetSelectedCore (true);
			}