private void btnReportWeek_Click(object sender, EventArgs e) { char_order.Series.Clear(); char_order.Titles.Clear(); // char_order = new System.Windows.Forms.DataVisualization.Charting.Chart(); char_order.Series.Add("Number Of Product"); char_order.DataSource = orderBUS.GetTopProductSellByWeek(); char_order.Series["Number Of Product"].XValueMember = "ProductID"; char_order.Series["Number Of Product"].YValueMembers = "Number Of Product"; char_order.Titles.Add("Number product sell Chart"); char_order.Show(); }