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The following example creates a TaxableProduct object, casts it to a Product reference, and then checks whether the object can be safely cast back into a TaxableProduct (it can). You ll notice that the actual conversion uses the CType() function introduced in the previous chapter. ' Define two empty variables (don't use the New keyword). Dim theProduct As Product Dim theTaxableProduct As TaxableProduct ' This works, because TaxableProduct derives from Product. theProduct = New TaxableProduct() ' This will be True. If TypeOf theProduct Is TaxableProduct Then ' Convert theObject, and assign to theTaxableProduct. theTaxableProduct = CType(theProduct, TaxableProduct) End If Dim totalPrice As Decimal ' This works. totalPrice = theTaxableProduct.TotalPrice ' This won't work, even though theTaxableProduct and theProduct are the same ' object. The compiler sees that theProduct is declared as a Product variable, ' and the Product class doesn't provide a TotalPrice property. totalPrice = theProduct.TotalPrice At this point, it might seem that being able to convert objects is a fairly specialized technique that will be required only when you re using inheritance. This isn t always true. Object conversions are also required when you use some particularly flexible classes.

</connectionStrings> <!-- Only administrators are allowed to access CatalogAdmin.aspx --> <location path="CatalogAdmin.aspx"> <system.web> <authorization> <allow roles="Administrators" /> <deny users="*" /> </authorization> </system.web> </location> <system.web> ...

Figure 9-13. The ASP .NET state service Once you find the service in the list, you can manually start and stop it by rightclicking it. Generally, you ll want to configure Windows to automatically start the service. Right-click it, select Properties, and modify the Startup Type, setting it to Automatic, as shown in Figure 9-14.

Note When using StateServer mode, you can also set an optional stateNetworkTimeout attribute that

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private DataSet BuildDataSet(string commandText, string tableName) { // DataSet we're going to return DataSet myDataSet = new DataSet(); // set up connection string string ConnectionString = ConfigurationManager. ConnectionStrings["SqlConnectionString"].ConnectionString; // create SqlConnection and SqlCommand objects SqlConnection myConnection = new SqlConnection(ConnectionString); SqlCommand myCommand = new SqlCommand(commandText, myConnection); // Create the SqlDataAdapter SqlDataAdapter myAdapter = new SqlDataAdapter(myCommand); try { // open the database connection myConnection.Open(); // fill the DataSet myAdapter.Fill(myDataSet, tableName); } finally { // always close the connection myConnection.Close(); } // return the DataSet return(myDataSet); } 7. Modify the Page_Load event to use the BuildDataSet() method to retrieve the data and populate the Web list control. Since this needs to be done only when the page first loads, the code needs to run only when the page hasn t been posted back. protected void Page_Load(object sender, EventArgs e) { if (Page.IsPostBack == false) { // set up SQL query for Manufacturer table string CommandText = "SELECT ManufacturerID, ManufacturerName FROM Manufacturer";

specifies the maximum number of seconds to wait for the service to respond before canceling the request. The default value is 10 (seconds).

Congratulations for finishing this long exercise! First, test that your new features work as expected Try also to access the CatalogAdminaspx page without being logged in as Administrator or try to log out when you re in the admin page You should be forwarded to the login page In this exercise, you first added the Administrators role and the admin user to your site You performed these tasks using the ASPNET Web Application Administration page Feel free to check out other options of that page as well For instance, you can access and manage the options you saved to webconfig (such as SiteName, and so on) by going to the Application tab, and then clicking Create/Manage application settings The security data is saved in the App_Data folder of your application, in either an Access database or in an SQL Server Express database named ASPNETDB.

This setting instructs ASP.NET to use an SQL Server database to store session information, as identified by the sqlConnectionString attribute. This is the most resilient state store but also the slowest by far. To use this method of state management, you ll need to have a server with SQL Server installed. When setting the sqlConnectionString attribute, you follow the same sort of pattern you use with ADO.NET data access. Generally, you ll need to specify a data source (the server address) and a user ID and password, unless you re using SQL integrated security. In addition, you need to install the special stored procedures and temporary session databases. These stored procedures take care of storing and retrieving the session information. ASP.NET includes a Transact-SQL script for this purpose called InstallSqlState.sql. It s found in the C:\[WinDir]\Microsoft.NET\Framework\[Version] directory. You can run this script using an SQL Server utility such as SQL Server Management Studio and sqlcmd.exe (for SQL Server 2005) or OSQL.exe and Query Analyzer (for earlier versions). It needs to be performed only once. Ordinarily, the state database is always named ASPState. As a result, the connection string in the web.config file doesn t explicitly indicate the database name. Instead, it simply reflects the location of the server and the type of authentication that will be used:

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