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The next example shows a more interesting demonstration of caching, which includes retrieving information from a database and storing it in a DataSet. This information is then displayed in a GridView. However, the output for the web page can t be efficiently cached because the user is given the chance to customize the display by hiding any combination of columns. Note that even with just ten columns, you can construct more than a thousand different possible views by hiding and showing various columns. These are far too many columns for successful output caching! Figure 26-7 shows the page.

Let s add the security mechanism in the following exercise, where you ll Create a role named Administrators for your application, and then a user named admin that is associated with the role. Add the UserInfo control to your application that displays data about the currently logged-in user (refer to Figure 8-1). Create a login page named Login.aspx. Create the skeleton of the catalog administration page (CatalogAdmin.aspx). Make the CatalogAdmin.aspx page accessible only by users of the Administrators role.

Figure 26-7. Filtering information from a cached DataSet The DataSet is constructed in the dedicated RetrieveData() function shown here:

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We ve discussed a great deal of this code already, but it makes a lot of difference to see it in action. Seeing how DataTextField and DataValueField translate inside a data-bound list, for example, is helpful. When the page is first loaded, you need to populate the list from the database. However, this list will never change as you use the page, so you don t need to repopulate it each time you click the values it contains. Consequently, you set up a simple test to check whether the page has posted back. If it hasn t, you ll populate the list. if (Page.IsPostBack == false) {

Private Function RetrieveData() As DataSet Dim connectionString As String = _ WebConfigurationManager.ConnectionStrings("Northwind").ConnectionString Dim SQLSelect As String = "SELECT * FROM Customers" Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand(SQLSelect, con) Dim adapter As New SqlDataAdapter(cmd) Dim ds As New DataSet() Try con.Open() adapter.Fill(ds, "Customers") Finally con.Close() End Try

1. The first step is to create an admin user to be recognized by your ASP.NET application. This user will have the privilege to access the catalog administration page. Start the ASP.NET Web Site Administration Tool by clicking WebSite ASP.NET Configuration. 2. Click the Security tab. You should get a screen like the one shown in Figure 8-7.

When the page is first loaded, the list of columns is shown in a CheckBoxList control named chckColumns. In order to do this, the code binds the collection of columns for the Customers table, as shown here:

Although the DataTextField and DataValueField properties specify what will populate the list, there s still no need to query the database for any more than those columns. You re using a DataReader, so you can t access any extra information from it anyway once you DataBind() it to the list. // set up SQL query for Manufacturer table myCommand.CommandText = "SELECT ManufacturerID, ManufacturerName FROM Manufacturer"; // run query SqlDataReader myReader = myCommand.ExecuteReader(); // set up the list lstManufacturers.DataSource = myReader; lstManufacturers.DataBind(); // close the reader myReader.Close(); }

chkColumns.DataSource = ds.Tables(0).Columns chkColumns.DataMember = "Item" chkColumns.DataBind()

Figure 8-7. The ASP.NET Web Site Administration Tool 3. Click Enable roles. 4. Click Create or Manage roles and create a new role named Administrators. Click Back. 5. The default authentication type is Windows. Click Select authentication type and select the From the Internet option. Click Done. 6. Click Create user and add a new user that will be allowed to perform catalog administration tasks. We ll assume you add a new user named admin with the password BalloonShop!. Add some text of your choice for E-mail, Security Question, and Security Answer. Assign the user to the Administrators role by checking the check box, and click Create User (see Figure 8-8).

The DataSet is inserted into the cache with a sliding expiration of two minutes when the page is loaded:

looked at inline binding), as this makes the code a little more self-contained. This way, you don t need to have a global reference to the DataReader for the page.

Cache.Insert("DataSet", ds, Nothing, DateTime.MaxValue, _ TimeSpan.FromMinutes(2))

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