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At any point after, you can call the RetrieveStatistics() method to examine this information, or you can use ResetStatistics() to clear it out and start from scratch Here s an example that displays the number of bytes received by the connection since you enabled statistics: Hashtable statistics = conRetrieveStatistics(); lblBytesText = "Retrieved bytes: " + statistics["BytesRetrieved"]ToString(); Statistics are provided in a loosely typed name/value collection That means you need to know the specific name of a statistic in order to retrieve it You can find the full list in the MSDN help, but here are a few of the most useful: ServerRoundtrips: Indicates the number of times the connection has made a request to the database server Typically, this value corresponds to the number of commands you ve executed, but strategies such as command batching can affect it.

Tip You can also specify authorization rules for subfolders in the root Web.config using the <location>

NET framework will call your RaisePostDataChangedEvent() method further down in the page processing life cycle If you return false, ASPNET will skip the callback notification for your control..

ConnectionTime: Indicates the cumulative amount of time the connection has been open BytesReceived: Indicates the total number of bytes retrieved from the database server (as a cumulative result of all the commands you ve executed) SumResultSets: Indicates the number of queries you ve performed SelectRows: Records the total number of rows retrieved in every query you ve executed..

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The Command class allows you to execute any type of SQL statement. Although you can use a Command class to perform data-definition tasks (such as creating and altering databases, tables, and indexes), you re much more likely to perform data-manipulation tasks (such as retrieving and updating the records in a table). The provider-specific Command classes implement standard functionality, just like the Connection classes. In this case, the IDbCommand interface defines the core set of Command methods that are used to execute a command over an open connection.

For example, let s say that you have an application structure with three protected folders and one public folder. You want to disable anonymous access to the protected folders, enable access to the public folder, and do as little configuration as possible. To do this, you would create a Web.config in the application s root folder and a Web.config in the public folder. Figure 12-21 shows how it would appear.

Before you can use a command, you need to choose the command type, set the command text, and bind the command to a connection. You can perform this work by setting the corresponding properties (CommandType, CommandText, and Connection), or you can pass the information you need as constructor arguments. The command text can be a SQL statement, a stored procedure, or the name of a table. It all depends on the type of command you re using. Three types of commands exist, as listed in Table 7-3. Table 7-3. Values for the CommandType Enumeration

A commonly used HTML form input element is the <input type="text"> tag. The ASP.NET framework provides controls that render this type of tag, including System.Web.UI.HtmlControls. HtmlInputText and System.Web.UI.WebControls.TextBox. We reinvent the wheel here (see Listing 3-8) to show you how these controls use ViewState and work with the postback data submitted from a web form.

The command will execute a direct SQL statement. The SQL statement is provided in the CommandText property. This is the default value. The command will execute a stored procedure in the data source. The CommandText property provides the name of the stored procedure. The command will query all the records in the table. The CommandText is the name of the table from which the command will retrieve the records. (This option is included for backward compatibility with certain OLE DB drivers only. It is not supported by the SQL Server data provider, and it won t perform as well as a carefully targeted query.)

Figure12-21. Multiple authorization settings in multiple Web.config files You would then place the following <authorization> section in Web.config file of the application s root directory (see Listing 12-6). Listing 12-6. Applicationwide Authorization Settings <configuration> <system.web> <authorization> <deny users=" "/> </authorization> </system.web> </configuration>

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