string sconstr = "server=.\\sqlexpress;database=account;Trusted_Connection=true;";
            SqlConnection sconn = new SqlConnection(sconstr);
            DataTable dbdt = new DataTable();
         
            SqlDataAdapter da = new SqlDataAdapter("select * from report where year='2010'",sconn);
            da.Fill(dbdt);
            dataGridView1.DataSource = dbdt;
            chart1.DataSource = dbdt;
            chart1.Series[0].YValueMembers = "traffic_am";
            chart1.Series[0].Name = "traffic_am";
            chart1.Series[1].YValueMembers = "traffic_pm";
            chart1.Series[1].Name = "traffic_pm";
            chart1.Series[0].XValueMember = "month";
            chart1.DataBind();