1) Install the ScottPlot.WinForms NuGet package
2) Drag a FormsPlot from the toolbox onto the form

Form1.cs

namespace WinFormsAppEx319
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void formsPlot1_Load(object sender, EventArgs e)
        {
            // generate some random X/Y data
            int pointCount = 1000;
            Random rand = new Random(0);
            double[] xs1 = ScottPlot.DataGen.RandomWalk(rand, pointCount);
            double[] ys1 = ScottPlot.DataGen.RandomWalk(rand, pointCount);
            double[] xs2 = ScottPlot.DataGen.RandomWalk(rand, pointCount);
            double[] ys2 = ScottPlot.DataGen.RandomWalk(rand, pointCount);

            // plot the data
            formsPlot1.Plot.PlotScatter(xs1, ys1);
            formsPlot1.Plot.PlotScatter(xs2, ys2);

            // additional styling
            formsPlot1.Plot.Title($"Scatter Plot ({pointCount} points per group)");
            formsPlot1.Plot.XLabel("X");
            formsPlot1.Plot.YLabel("Y");
            formsPlot1.Refresh();
        }
    }
}