Grid Fill Colors

Regions between alternating pairs of major grid lines may be filled with a color specified by the user

ScottPlot.Plot myPlot = new();

myPlot.Add.Signal(Generate.Sin());
myPlot.Add.Signal(Generate.Cos());

// shade regions between major grid lines
myPlot.Grid.XAxisStyle.FillColor1 = Colors.Gray.WithOpacity(0.1);
myPlot.Grid.XAxisStyle.FillColor2 = Colors.Gray.WithOpacity(0.2);
myPlot.Grid.YAxisStyle.FillColor1 = Colors.Gray.WithOpacity(0.1);
myPlot.Grid.YAxisStyle.FillColor2 = Colors.Gray.WithOpacity(0.2);

// show minor grid lines too
myPlot.Grid.XAxisStyle.MinorLineStyle.Width = 1;
myPlot.Grid.YAxisStyle.MinorLineStyle.Width = 1;

myPlot.SavePng("demo.png", 400, 300);

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This recipe is one of many in the Customizing Grids category