https://learn.microsoft.com/tr-tr/dotnet/api/system.windows.forms.datavisualization.charting.datapoint.xvalue?view=netframework-4.8.1
DataPoint.XValue Property (System.Windows.Forms.DataVisualization.Charting) | Microsoft Learn
Gets or sets the X-value of a data point.
property systemwindows formsdatapointdatavisualizationcharting