public static class DataSource
{
    private static Random _random = new Random();
    public static BindingList<SalesInfo> GetSalesInfo()
    {
        var countries = "US,Germany,UK,Japan,Italy,Greece".Split(',');
        var products = "Phones,Cars,Stereos,Watches,Computers".Split(',');
        BindingList<SalesInfo> data = new();
        for (var i = 0; i < 50; i++)
        {
            data.Add(new SalesInfo
            {
                Id = i,
                Country = countries[_random.Next(0, countries.Length)],
                Product = products[_random.Next(0, products.Length)],
                Date = DateTime.Now.AddDays(i),
                Sales = Math.Round(_random.NextDouble() * 10000, 2),
                Expenses = Math.Round(_random.NextDouble() * 5000, 2),
            });
        }
        return data;
    }
}

public class SalesInfo
{
    public int Id { get; set; }
    public string Country { get; set; }
    public string Product { get; set; }
    public DateTime Date { get; set; }
    public double Sales { get; set; }
    public double Expenses { get; set; }
}