By default, the x and y value of a point is displayed as the tooltip when you place the mouse over a Chart point. The LabelFormat property of horizontal axis used by the series is used to format the x value displayed in tooltip and the LabelFormat property of vertical axis used by the series is used to format the y value of text displayed in tooltip.
The following screenshot displays the Chart with formatted y value of the point in tooltip text.
Figure 1: Chart with formatted tooltip text
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