System.Windows.Forms.ListView.ToggleItemsCheckState C# (CSharp) Method

		void ToggleItemsCheckState ()
		{
			if (!CheckBoxes)
				return;

			// Don't modify check state if StateImageList has less than 2 elements
			if (StateImageList != null && StateImageList.Images.Count < 2)
				return;

			if (SelectedIndices.Count > 0) {
				for (int i = 0; i < SelectedIndices.Count; i++) {
					ListViewItem item = Items [SelectedIndices [i]];
					item.Checked = !item.Checked;
				}
				return;
			} 
			
			if (FocusedItem != null) {
				FocusedItem.Checked = !FocusedItem.Checked;
				SelectIndex (FocusedItem.Index);
			}
		}