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When an image is displayed next to a node (when the TreeNode.ImageUrl property is set), use the TreeNode.ImageToolTip property to specify the ToolTip displayed when the user positions the mouse pointer over the image. The text that you specify provides assistive technology devices with a description of the image that can be used to make the control more accessible.
The value of this property is stored in view state.
The value of this property, when set, can be saved automatically to a resource file by using a designer tool. For more information, see System.ComponentModel.LocalizableAttribute and ASP.NET Globalization and Localization.