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Health monitoring is a process for verifying the application s state while being operated in production environments. It is used for several reasons, such as catching errors, getting notified in case of errors, analyzing the performance of the application, getting information about the payload for the application, and much more. Monitoring usually is implemented through a mechanism called instrumentation, which is a technique used for adding events, performance counters, and tracing capabilities to an application. Through these tracing capabilities, administrators, operational staff, and developers have the possibility of monitoring the application based on several aspects. However, instrumentation is something that has to be integrated into the application s architecture in a way that makes monitoring useful and convenient. ASP.NET 2.0 ships with an integrated health monitoring system that is completely consumable through a health monitoring API. Therefore, the instrumentation capabilities are integrated into the platform itself. You will now learn about the fundamentals of this instrumentation system.

The system is split up into two major parts: types of events that are implemented in a set of event classes and providers that are responsible for processing different types of events. You can see this when looking at the basic structure of the health monitoring configuration that is part of the web.config configuration file: <healthMonitoring Enabled="true|false" heartBeatInterval="time interval"> <providers>... </providers> <eventMappings>... </eventMappings> <profiles>... </profiles> <rules>... </rules> </healthMonitoring> Through the <providers> element you can configure a number of providers responsible for event processing. The events that can be processed are registered through the <eventMappings> element. The connection between providers and events is drawn through the <rules> element, which defines the provider responsible for processing an event and some additional parameters. The <rules> section on its own may reference profiles that are defined in the <profiles> section. These profiles are some additional parameters that can be used for configuring the behavior of the event processing mechanism. Examples for such parameters are the number of times the event has to happen until it is raised by the monitoring system and the time that has to take place between two events.

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When looking to store values across multiple requests, cookies are the tool of choice, passing values to the Web browser through special headers, which are then sent back to the server on subsequent requests By calling with a key and a value, the HTTP response sent to the client will contain a separate header, telling the browser what to store and when to send it back to the server In addition to just the key and value, can take a few extra arguments that configure when the browser should send the cookie back to the server While a quest for readability suggests that these arguments be specified using keywords, this list uses their positional order More details on what values are allowed for each of these options can be found in the official specification for HTTP state management.

The following example creates a simple query command to return all the records from the Employees table in the Northwind database. The command is created when the page is loaded. protected void Page_Load(object sender, System.EventArgs e) { // Create the Command and the Connection objects. string connectionString = WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString; SqlConnection con = new SqlConnection(connectionString); string sql = "SELECT * FROM Employees"; SqlCommand cmd = new SqlCommand(sql, con); ...

This SELECT query uses the * wildcard to retrieve all the fields, but in real-world code you should retrieve only the fields you really need in order to avoid consuming time to retrieve data you ll never use. It s also a good idea to limit the records returned with a WHERE clause if you don t need all the records.

The connection is then opened, and the command is executed through the ExecuteReader() method, which returns a SqlDataReader, as follows: ... // Open the Connection and get the DataReader. con.Open(); SqlDataReader reader = cmd.ExecuteReader(); ... Once you have the DataReader, you can cycle through its records by calling the Read() method in a while loop. This moves the row cursor to the next record (which, for the first call, means to the first record). The Read() method also returns a Boolean value indicating whether there are more rows to read. In the following example the loop continues until Read() returns false, at which point the loop ends gracefully.

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