why while click on price ranges it not shows the products?

protected void BulletedList3_Click(object sender, BulletedListEventArgs e)
  {

     string price = BulletedList3.Items[e.Index].Value;
      if (con.State == ConnectionState.Closed)
      {
          con.Open();
      }
      SqlCommand cmd = new SqlCommand("select pro_img,pro_name,price from product where price='" + price + "' and status='A' and type='retail'", con);
      SqlDataAdapter da = new SqlDataAdapter(cmd);
      DataSet ds = new DataSet();
      da.Fill(ds);
       DataList1.DataSource = ds;
      DataList1.DataBind();
      con.Close();
  }