C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            webBrowser1.Navigate("http://www.anyweb.com", "_self", null, "User-Agent: Mozilla/4.0 
        }
    }
}

public static double?[] slopeImpl(double?[] vals, int offset)
{
    double y = 0;

    int iterableLength = vals.Length;

    int numValues = vals.Length;
    double invNumValues = 1.0 / (vals.Length - offset);
    double x = (double)(((numValues * (numValues - 1)) >> 1) - ((offset * (offset - 1)) >> 1));

    for (int i = offset; i < iterableLength; i++) {

        y += (vals[i].GetType() == typeof(System.DBNull)) ? 0.0 : (double)vals[i];
    }

    y = y * invNumValues;

    double v1 = 0.0;
    double v2 = 0.0;
    double v2HalfResult = 0.0;

    for (int i = offset; i < iterableLength; i++) {
        v2HalfResult = (i - x);
        v1 += (v2HalfResult) * ((double)vals[i] - y);
        v2 += (v2HalfResult) * (v2HalfResult);
    }

    double slope = v1 / v2;
    double intercept = y - slope * x;

    double?[] result = new double?[2];
    result[0] = slope;
    result[1] = intercept;
    return result;
}