var yAxis = new NumericYAxis();
var xAxis = new CategoryXAxis();
xAxis.CrossingAxis = yAxis;
yAxis.CrossingAxis = xAxis;
xAxis.CrossingValue = 100;
yAxis.CrossingValue = 20;
xAxis.LabelLocation = AxisLabelsLocation.InsideBottom;
yAxis.LabelLocation = AxisLabelsLocation.InsideLeft;