How to display WinForms Chart tooltips?

In WinForms Chart control, tooltips are used to display additional information when hovering over chart elements such as data points or chart areas. You can enable tooltips by setting the ShowToolTips property to true. By default, tooltips show the Y-value of the series. 

To display custom text, use the PointsToolTipFormat property (e.g., "{1}" - The default Y value will be replaced by the corresponding ChartSeries.Style.ToolTip). Tooltips can also be applied to the chart area using the ChartAreaToolTip property.

For more details on supported format specifiers in PointsToolTipFormat, refer to the WinForms Chart documentation.

this.chartControl1 = new ChartControl();
. . .
this.chartControl1.ShowToolTips = true;

ChartSeries series1 = new ChartSeries("Sales Performance", ChartSeriesType.Column);

// Chart Area Tooltips

this.chartControl1.ChartArea.ChartAreaToolTip = "Chart Area";

// Series points Tooltips

series1.PointsToolTipFormat = "{1}";

series1.Style.ToolTip = "Series1";

Me.ChartControl1 = New ChartControl()
. . .
Me.ChartControl1.ShowToolTips = True

Dim series1 As ChartSeries = New ChartSeries("Sales Performance", ChartSeriesType.Column)

' Chart Area Tooltips

Me.ChartControl1.ChartArea.ChartAreaToolTip = "Chart Area"

' Series points Tooltips

series1.PointsToolTipFormat = "{1}"

series1.Style.ToolTip = "Series1"

Output