private void formStaticticsDG_Load(object sender, EventArgs e)
{
//dataGridView1.DataSource = bl.GetStaticticsDG();
chart1.DataSource = bl.GetStaticticsDG();
chart1.Series["Series1"].XValueMember = "Số tuổi";
chart1.Series["Series1"].YValueMembers = "Số độc giả";
//this.chart1.Titles.Add("Category Title");
//chart1.Series["Series1"].ChartType = SeriesChartType.Pie;
chart1.Series["Series1"].IsValueShownAsLabel = true;
}
