The axis lines are lines that appear horizontally from the starting value to the ending value for the Y-Axis and vertically from the starting value to the ending value for the X-Axis. The Z-axis line is used in 3D charts.
You can use either the Axis.Foreground or the ShapeStyle.Stroke property to apply color to the axis line. Note that the Axis.Foreground property overrides the ShapeStyle.Stroke property.
You can specify the type of shape for the starting and ending points of the axis line using the StrokeStartLineCap and StrokeEndLineCap properties.