Program.cs

using System.Drawing;
using Charting.Window;

//*--------------------Fast charting-----------------------*/

GraphCreator.Start(x => x * x, "y = x^2");
GraphCreator.Start(Math.Sqrt, "Sqrt(x)");
GraphCreator.Start(new[] { (1d, 30d), (2d, 25d), (3d, 10d) },
    InterpolationAlgorithm.CatmullRomSpline,
    "Points");

//*========================================================*/

//*------------------Using GraphBuilder--------------------*/

//function
var builder = new GraphBuilder();
builder
    .SetFunction(Math.Cos)
    .SetName("Cos(x)")
    .SetDx(0.01)
    .SetRange(-10, 10)
    .SetColor(Color.Blue);
var graph = new GraphCreator(builder);
graph.Start();

//point function
var points = new List<(double, double)>();
points.Add((1, 2)); points.Add((2, 8)); points.Add((3, 4));
var graphPointsBuilder = new GraphBuilder()
    .SetPoints(points)
    .SetName("Points")
    .UseInterpolationAlgorithm(InterpolationAlgorithm.CanonicalSpline);
new GraphCreator(graphPointsBuilder, new DesignBuilder().SetTitle("Points")).
    Start();

//*========================================================*/

//*--------------------Several graphs----------------------*/

var pointsBuilder = new GraphBuilder().SetPoints(points).SetColor(Color.Red);
var graphBuilder = new GraphBuilder()
    .SetFunction(x => 2 * x)
    .SetName("2x")
    .SetDx(0.01)
    .SetRange(-20, 20);
var graphs = new GraphCreator(new[] {builder, graphBuilder, pointsBuilder });
graphs.Start();

//*========================================================*/

/*--------------------Live charting-----------------------*/

var liveBuilder = new GraphBuilder()
    .SetColor(Color.Yellow);
var liveDesignBuilder = new DesignBuilder()
    .SetVisiblePoints(25)
    .SetBackColor(Color.Black)
    .SetBorderColor(Color.LightGreen)
    .SetTextColor(Color.LightGreen)
    .SetTitleColor(Color.LightGreen)
    .SetTitle("Your data");
var liveGraph = new GraphCreator(liveBuilder, liveDesignBuilder);
liveGraph.Start();

var rand = new Random();
for (int i = 0; i < 100; i++)
{
    liveBuilder.AddPoint((i, 100 * rand.NextDouble()));
    liveGraph.Update();

    Thread.Sleep(100);
}

/*========================================================*/

Console.ReadKey(); //Don't forget about this if you don't use await