اتصال چارت به دیتابیس در vs2010

[gerdioz]

سلام دوستان مشکل این کد چیه که خروجی نمیده

        private void Show_Chart(string sql_)

        {

            DataGridView dt = new DataGridView();

            OleDbCommand command = new OleDbCommand();

            OleDbConnection connection = new OleDbConnection();

            connection.Close();

            connection.ConnectionString = con.ConnectionString;

            connection.Open();

            OleDbDataAdapter adaptor = new OleDbDataAdapter(sql_, connection);

            DataTable dtt = new DataTable();

            adaptor.Fill(dtt);

        }

[gerdioz]

ببخشید کد رو اصلاح میکنم

        private void Show_Chart(string sql_)

        {

            DataGridView dt = new DataGridView();

            OleDbCommand command = new OleDbCommand();

            OleDbConnection connection = new OleDbConnection();

            connection.Close();

            connection.ConnectionString = con.ConnectionString;

            connection.Open();

            OleDbDataAdapter adaptor = new OleDbDataAdapter(sql_, connection);

            DataTable dtt = new DataTable();

            adaptor.Fill(dtt);

            chart1.DataSource = dtt;

            chart1.DataBind();

        }