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ListBox.SelectedIndexCollection.IndexOf Method

Returns the index within the ListBox.SelectedIndexCollection of the specified index from the ListBox.ObjectCollection of the ListBox.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public int IndexOf(
	int selectedIndex


Type: System.Int32

The zero-based index from the ListBox.ObjectCollection to locate in this collection.

Return Value

Type: System.Int32
The zero-based index in the collection where the specified index of the ListBox.ObjectCollection was located within the ListBox.SelectedIndexCollection; otherwise, negative one (-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 index position within the ListBox.ObjectCollection for the ListBox is stored within the ListBox.SelectedIndexCollection.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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