using System;

using System.Collections.Generic;

using System.Drawing;

public class Program

{

    public static void Main()

    {

        var lista = new List<PointF> { new PointF(500, 100),new PointF(1000, 100),new PointF(1500, 110),new PointF(2000, 140),new PointF(2100, 160) };

        double m,b;

        FindLinearLeastSquaresFit(lista, out m, out b);

        Console.WriteLine("M:" + m + " B:" + b);

    }

    public static void FindLinearLeastSquaresFit(

    List<PointF> points, out double m, out double b)

{

    // Perform the calculation.

    // Find the values S1, Sx, Sy, Sxx, and Sxy.

    double S1 = points.Count;

    double Sx = 0;

    double Sy = 0;

    double Sxx = 0;

    double Sxy = 0;

    foreach (PointF pt in points)

    {

        Sx += pt.X;

        Sy += pt.Y;

        Sxx += pt.X * pt.X;

        Sxy += pt.X * pt.Y;

    }

​

    // Solve for m and b.

    m = (Sxy * S1 - Sx * Sy) / (Sxx * S1 - Sx * Sx);

    b = (Sxy * Sx - Sy * Sxx) / (Sx * Sx - S1 * Sxx);

​

}

}