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Frequently, an application needs to notify the user that an event has occurred or ask for confirmation before proceeding with an operation. These interactions are often brief interactions designed to simply inform the user of a change in the application or to obtain a simple response. Some of these interactions may appear modal to the user, such as when the UI displays a dialog box or a message box, or they may appear non-modal, such as when the UI displays a toast notification or a pop-up window. There are multiple ways to interact with the user in these cases, but implementing them in an MVVM-based application in a way that preserves a clean separation of concerns can be challenging. For example, in a non-MVVM application, you could use the MessageBox class in the UI s code-behind file to prompt the user for a response. In an MVVM application, this would not be appropriate because it would break the separation of concerns between the view and the view model. In the MVVM pattern, the view model is responsible for initiating an interaction with the user and for consuming and processing any response, while the view is responsible for actually managing the interaction with the user by employing whatever user experience is appropriate. Preserving the separation of concerns between the presentation logic implemented in the view model, and the user experience implemented by the view, helps to improve testability and flexibility.

This small segment tells the ASP .NET runtime to use Forms Authentication (one of the ASP .NET authentication options) to authenticate users of this site . The configuration

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information also tells ASP .NET to use SQL Server to manage session state, to allow session state information to expire after 25 minutes, and to track session information using a session ID embedded in the request Uniform Resource Identifier (URI) . 14, Session State, examines session state in detail for now, it s a good example to illustrate some of the parameters ASP .NET configuration manages . You can see from this example that configuring ASP .NET relies on the ability of the runtime to understand some keywords . In this case, the keywords authentication, mode, and Forms tell ASP .NET how to manage authentication . ASP .NET must correctly interpret sessionState, mode, SQLServer, cookieless, UseURI, and timeout to know how to manage an application s session state . The .NET components that understand these vocabularies are listed near the top of machine .config .

<configuration> <configSections> <section name="appSettings" type="{entire strong assembly name here...}" restartOnExternalChanges="false" /> <section name="connectionStrings" type="{entire strong assembly name here...}" /> ... <sectionGroup name="system.web" type="{entire strong assembly name here...}"> <section name="authentication" type="{entire strong assembly name here...}" allowDefinition="MachineToApplication" /> <section name="sessionState" type="{entire strong assembly name here...}" allowDefinition="MachineToApplication" /> ... </sectionGroup> </configSections> </configuration>

There are two common approaches to implementing these kinds of user interactions in the MVVM pattern. One approach is to implement a service that can be used by the view model to initiate interaction with the user, thereby preserving its independence from the view s implementation. Another approach uses events raised by the view model to express the intent to interact with the user, along with components in the view that are bound to these events and that manage the visual aspects of the interaction. Each of these approaches is described in the following sections. In this approach, the view model relies on an interaction service component to initiate interaction with the user by using a message box. This approach supports a clean separation of concerns and testability by encapsulating the visual implementation of the interaction in a separate service component. Typically, the view model has a dependency on an interaction service interface, and it uses dependency injection or a service locator to acquire a reference to the interaction service s implementation. After the view model has a reference to the interaction service, it can programmatically request interaction with the user whenever necessary. The interaction service implements the visual aspects of the interaction, as shown in the following illustration. Using an interface reference in the view model allows different implementations to be used, according to the implementation requirements of the user interface. For example, implementations of the interaction service for WPF and Silverlight could be provided, thus allowing for greater reuse of the application s presentation logic.

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