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TreeNodeCollection.IList.Add Method

This API supports the .NET Framework infrastructure and is not intended to be used directly from your code.

Adds an object to the end of the tree node collection.

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

int IList.Add(
	Object node


Type: System.Object
The object to add to the tree node collection.

Return Value

Type: System.Int32
The zero-based index value of the TreeNode that was added to the tree node collection.




node is currently assigned to another TreeView control.


node is null.

If node is not a TreeNodeCollection, the IList.Add method will use the string returned by the ToString method of the TreeNode class.

.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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