private void fHomePages_Load(object sender, EventArgs e) { Account = ConnectSQL.ExcuteQuery("Select IDStaff, Status from Account"); for (int i = 0; i < Account.Rows.Count; i++) { if (Account.Rows[i][1].ToString() == "1") { ReturnIDAccount = Account.Rows[i][0].ToString(); } } Bill = ConnectSQL.ExcuteQuery("select distinct YEAR(date) from Bill"); for (int i = 0; i < Bill.Rows.Count; i++) { if (Bill.Rows[0][0] != DBNull.Value) { cbYear.Items.Add(Bill.Rows[i][0].ToString()); } } cbYear.SelectedIndex = 0; cMonth.Checked = true; chartMonth.ChartAreas[0].AxisX.Minimum = 1; chartMonth.ChartAreas[0].AxisX.Maximum = 12; timer1.Start(); CreateChartMonth(); CreateChartQuy(); CreateChartProduct(); CreateChartCustomer(); rProduct.Checked = true; chartCustomer.Visible = false; }