Gets or sets the object that contains programmer-supplied data associated with the System.Windows.Forms.ToolTip.
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Typically, you use the ToolTip.Tag property to store data that is closely associated with the System.Windows.Forms.ToolTip. For example, if you are displaying a System.Windows.Forms.ToolTip for a control that displays customer information, you might store the System.Data.DataSet that contains the customer's information in the ToolTip.Tag property so the data can be accessed quickly.