private void Report_Click(object sender, EventArgs e)
{
var dateFrom = dateTimePicker1.Value;
var dateTo = dateTimePicker2.Value;
//var result = saleslist.slist1.Where(p => p.Date >= dateFrom && p.Date <= dateTo).ToList();
var result = myShop.AccessReport(dateFrom, dateTo);
dataGridView1.DataSource = result;
}