Visual Basic.NET - Ayuda Numeros al azar y contador para DataGridView

private void button1_Click(object sender, EventArgs e)

{

    List<Random> Peso = new List<Random>();

    Random rnd = new Random();

    for (int i = 0; i < 10; i++)

    {

        int valor = rnd.Next(7900, 8200);

        lista.Add(new Random() { Nro = valor });

    }

    DGVListar.AutoGenerateColumns = true;

    DGVListar.DataSource = Peso;

}

using System;

using System.Collections.Generic;

using System.Drawing;

using System.Windows.Forms;

namespace WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        List<Peso> lista;

        Random rnd;

        public Form1()

        {

            InitializeComponent();

            lista = new List<Peso>();

            rnd = new Random();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            for (int i = 0; i < 10; i++)

            {

                int valor = rnd.Next(7900, 8200);

                lista.Add(new Peso() { Valor = valor });

            }

            DGVListar.DataSource = null;

            DGVListar.DataSource = lista;

        }

        private void DGVListar_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)

        {

            if (e.ColumnIndex == 0)

            {

                if (!((int)e.Value < 8000) && !((int)e.Value > 8120))

                {

                    e.CellStyle.BackColor = Color.LightGreen;

                }

            }

        }

    }

    class Peso

    {

        public int Valor { get; set; }

    }

}