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1. Your page runs for the first time. ASP.NET creates page and control objects, the initialization code executes, and then the page is rendered to HTML and returned to the client. The page objects are also released from server memory. 2. At some point, the user does something that triggers a postback, such as clicking a button. At this point, the page is submitted with all the form data by using ViewState information. 3. ASP.NET intercepts the returned page and re-creates the page objects, taking care to return them to the state they were in the last time the page was sent to the client. 4. Next ASP.NET checks what operation triggered the postback, and it raises the appropriate events (such as Button.Click), which your code can react to. Typically, at this point you ll perform some server-side operation (such as updating a database or reading data from a file) and then modify the control objects to display new information. 5. The modified page is rendered to HTML and returned to the client. The page objects are released from memory. If another postback occurs, ASP.NET repeats the process in steps 2 through 4. In other words, ASP.NET doesn t just use the form data to configure the control objects for your page. It also uses it to decide what events to fire. For example, if it notices the text in a text box has changed since the last postback, it raises an event to notify your page. It s up to you whether you want to respond to this event.

A common mistake is to use localhost or any other aliases for the server host name in an SSL connection. This will not work, because the client attempts to verify that the CN (common name) part of the subject name of the server certificate matches the host name found in the HTTP request during the handshake portion of the SSL exchange.

Catches all types of audits, as this is the general base class for audit events. Catches all audits designated to failures such as invalid logins or access denied errors. Catches all audits designated to succeeding operations.

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Keep in mind that since HTML is completely stateless, and all state made available by ASP.NET is reconstituted, the event-driven model is really an emulation. ASP.NET performs quite a few tasks in the background in order to support this model, as you ll see in the following sections. The beauty of this concept is that the beginner programmer doesn t need to be familiar with the underpinnings of the system to take advantage of server-side events.

Basically, any type of provider can process these events. Again, the system ships with a couple of providers, but only some of them are really configured in the machine-wide configuration, as shown in the following code snippet: <healthMonitoring...> <providers> <add name="EventLogProvider" type="System.Web.Management.EventLogWebEventProvider, System.Web,Version=2.0.0.0,Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> <add name="SqlWebEventProvider" ConnectionStringName="LocalSqlServer" maxEventDetailsLength="1073741823" buffer="false" bufferMode="Notification" type="System.Web.Management.SqlWebEventProvider, System.Web,Version=2.0.0.0,Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> <add name="WmiWebEventProvider" type="System.Web.Management.WmiWebEventProvider, System.Web,Version=2.0.0.0,Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> </providers> </healthMonitoring> Although only the three providers shown in the previous code snippet are configured by default, the framework ships with five providers. If you need another provider, just write a class inherited from the ProviderBase class of the namespace System.Configuration.Provider, and register the provider in the <providers> section of the <healthMonitoring> section in your own web.config in the same way as in the previous code snippet. The framework ships with the following providers: EventLogWebEventProvider is responsible for adding different types of events to the Windows event log of the local system. MailWebEventProvider is a provider for sending events via SMTP to a configured e-mail address. The e-mail address is added as a parameter to the provider entry in the same way as the ConnectionStringName parameter of the SqlWebEventProvider shown in the previous code snippet. SqlWebEventProvider offers the possibility for storing events into a SQL Server based database. Of course, the database requires some standard tables for the provider in place. The SQL scripts for creating and dropping those tables are available in the InstallWebEventSqlProvider.sql as well as UninstallWebEventSqlProvider.sql files in the .NET Framework directory.

With SSL, all traffic will be encrypted, not just the sensitive data. For this reason, many web servers use a hardware accelerator to improve the performance of encryption with SSL.

Of course, one gap exists in the event system described so far. Windows developers have long been accustomed to a rich event model that lets your code react to mouse movements, key presses, and the minutest control interactions. But in ASP .NET, client actions happen on the client side, and server processing takes place on the web server. This means a certain amount of overhead is always involved in responding to an event. For this reason, events that fire rapidly (such as a mouse move event) are completely impractical in the world of ASP.NET.

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