Determines whether the specified item is located in the collection.
public bool Contains(
A ListViewItem representing the item to locate in the collection.
true if the item is contained in the collection; otherwise, false.
The Contains method enables you to determine whether a ListViewItem is a member of the collection. Once you know that the item is in the collection, you can use the IndexOf method to determine the position of the item in the collection.
IndexOfListView.ListViewItemCollection ClassSystem.Windows.Forms Namespace