<peppe:ChartControl ID="ChartControl1" runat="server"
      DataSourceID="AccessDataSource1"
      DataTextField="Squadra" DataValueField="g22" />

<asp:AccessDataSource ID="AccessDataSource1" runat="server"
      DataFile="~/App_Data/classifica.mdb"
      SelectCommand="SELECT * FROM [Classifica]" />

<peppe:ChartControl ID="ChartControl2" runat="server"
      DataValueField="g22" DataTextField="Squadra"/>

protected void Page_Load(object sender, EventArgs e)
{
  string strConn = @"...";
  string sql = @"SELECT * FROM [Classifica]";
  OleDbConnection conn = new OleDbConnection(strConn);
  using (conn)
  {
    OleDbCommand cmd = new OleDbCommand(sql, conn);
    using (cmd)
    {
      OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);
      DataTable dt = new DataTable();
      adapter.Fill(dt);

      ChartControl2.DataSource = dt;
      ChartControl2.DataBind();
    }
  }
}