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ListBox.ObjectCollection.IndexOf Method

Returns the index within the collection of the specified item.

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

public int IndexOf(
	Object value
)

Parameters

value
Type: System.Object

An object representing the item to locate in the collection.

Return Value

Type: System.Int32
The zero-based index where the item is located within the collection; otherwise, negative one (-1).

Implements

IList.IndexOf(Object)

ExceptionCondition
ArgumentNullException

The value parameter is null.

The IndexOf method enables you to determine where an item is located within the collection. To determine whether an item is located within the collection before calling this method, use the Contains method.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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