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The following places I have founf fonts settings. Please ighlight yellow text: I could not get it to change to blackon white, sorry.
.ValueAxis ( axis => axis.Numeric ( ).Labels ( l => l.Font ( "8px Verdana" ) ) )
.CategoryAxis ( axis => axis.Labels ( l => l.Font ( " 8px Verdana" ) ) )
.Title ( t => t.Font ( "11px Verdana" ) )
.Legend ( legend => legend.Position ( ChartLegendPosition.Top ) )
.Legend ( legend => legend.Font ( "8px Verdana" ) )
.SeriesDefaults ( series =>
{
series.Line ( )
.Stack ( false )
.Labels ( labels => labels.Font( "8px, Verdana")).Labels(true)
.Markers ( markers => markers.Type ( ChartMarkerShape.Circle ).Size ( 3 ) );
} )
} )