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ErrorProvider and DataGridView controls in Windows Forms to automate the display of validation errors to the user. The list of broken rules is obviously linked to the framework s n-level undo capability. If the user changes an object s data so that the object becomes invalid, but then cancels the changes, the original state of the object must be restored. The reverse is true as well: an object may start out invalid (perhaps because a required field is blank), so the user must edit data until it becomes valid. If the user later cancels the object (or its parent, grandparent, etc.), then the object must become invalid once again, because it will be restored to its original invalid state. Fortunately, this is easily handled by treating the broken rules and validity of each object as part of that object s state. When an undo operation occurs, not only is the object s core state restored, but so is the list of broken rules associated with that state. The object and its rules are restored together.

As with any other application, when you re working with web or worker roles you need to be able to dynamically configure runtime settings without rebuilding the application from its source. In conventional web applications, the following settings (among others) are typically stored in configuration files: Database connection strings Service endpoints Filesystem paths Timeout settings Although these configuration settings are considered dynamic, in most applications they re rarely changed. The main reason for storing these runtime configuration settings in a configuration file is so that you can easily deploy your application between different environments (development, test, staging, and production). Typically, your production environment talks to different web services, a different database, or a different storage account from your development or staging environment. Using configuration files (rather than rebuilding your source code) to modify these endpoints greatly reduces the complexity, increases the maintainability, and simplifies the deployment process of your application. In this section we ll look at the following aspects of configuring your runtime settings: Configuring runtime settings in conventional web apps Defining your runtime configuration settings in Windows Azure Initially configuring your runtime configuration settings Reading your configuration settings Modifying your configuration settings dynamically at runtime Before we look at how to define your runtime configuration settings in Windows Azure, let s look at how you would do this in conventional ASP.NET web applications.

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Security and External Applications For external applications, things are entirely different. This is really

Another concept is that an object should keep track of whether its state data has been changed. This is important for the performance and efficiency of data updates. Typically, data should only be updated into the database if the data has actually changed. It s a waste of effort to update the database with values it already has! Although the UI developer could keep track of whether any values have changed, it s simpler to have the object take care of this detail, and it allows the object to better encapsulate its behaviors. This can be implemented in a number of ways, ranging from keeping the previous values of all fields (allowing comparisons to see if they ve changed) to saying that any change to a value (even changing it to its original value) will result in the object being marked as having changed. Rather than having the framework dictate one cost over the other, it will simply provide a generic mechanism by which the business logic can tell the framework whether each object has been changed. This scheme supports both extremes of implementation, allowing you to make a decision based on the requirements of a specific application.

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