MS Access connection

using System.Data.OleDb;
protected void btn_showst_Click()
    {
    OleDbConnection con;

    con = new OleDbConnection("Microsoft.Jet.OLEDB.4.0"      connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\databasename.mdb");

   // Here Access database should be in App_Data Folder..


  con.Open();
  OleDbCommand cmd = new OleDbCommand("select * from  tablename", con);
  OleDbDataReader dr;
  dr = cmd.ExecuteReader();
  GridView1.DataSource = dr;
  GridView1.DataBind();
  con.Close();
}