private void FrmCustomerList_Load(object sender, EventArgs e)
        {
            // TODO: This line of code loads data into the 'northwindDataSet.Customers' table. You can move, or remove it, as needed.
            //this.customersTableAdapter.Fill(this.northwindDataSet.Customers);
            //Option 1
            SqlHelper.ConnectionString = Settings.Default.ConnectionString;
            SqlHelper.Helper.Fill(CommandType.Text, "Select * from customers", northwindDataSet.Customers);
            //Option 2
            var sql = new SqlProvider(Settings.Default.ConnectionString);

            sql.Fill(CommandType.Text, "select * from customers", northwindDataSet.Customers);
            //Option 3
            var dao = new CustomersDA();

            dao.Fill(northwindDataSet.Customers);
        }