This documentation is archived and is not being maintained.

ListBox.SelectedObjectCollection.Contains Method

Determines whether the specified item is located within the collection.

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

public bool Contains(
	Object selectedObject


Type: System.Object

An object representing the item to locate in the collection.

Return Value

Type: System.Boolean
true if the specified item is located in the collection; otherwise, false.



The Contains method enables you to determine whether an item from the ListBox.ObjectCollection class is a member of the selected items stored in the ListBox.SelectedObjectCollection. You can use this to determine if a specific item in a multiple-selection ListBox is selected.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

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