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CheckedListBox.ObjectCollection.Add Method (Object, CheckState)

Adds an item to the list of items for a CheckedListBox, specifying the object to add and the initial checked value.

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

public int Add(
	Object item,
	CheckState check


Type: System.Object

An object representing the item to add to the collection.

Type: System.Windows.Forms.CheckState

The initial CheckState for the checked portion of the item.

Return Value

Type: System.Int32
The index of the newly added item.


The check parameter is not one of the valid CheckState values.

This method adds an item to the checked list box. For an unsorted checked list box, the item is added to the end of the existing list of items. For a sorted checked list box, the item is inserted into the list according to its sorted position. A SystemException occurs if there is insufficient space available to store the new item.

.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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