Box. Selected Object Collection. Index Of(Object) Method
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Returns the index within the collection of the specified item.
public: virtual int IndexOf(System::Object ^ selectedObject);
public int IndexOf (object selectedObject);
abstract member IndexOf : obj -> int override this.IndexOf : obj -> int
Public Function IndexOf (selectedObject As Object) As Integer
An object representing the item to locate in the collection.
The zero-based index of the item in the collection; otherwise, -1.
Once you know that an item is located within the collection (using the Contains method), you can use the IndexOf method to determine where a specific item within the ListBox.ObjectCollection for the ListBox is stored within the ListBox.SelectedObjectCollection.