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model The model is the data and related business logic or validation rules in your application. The model objects typically can retrieve, update, and add records to an underlying data store such as a Microsoft SQL Server database. A model can be a LINQ to SQL layer, an Entity Framework layer, or some other layer that provides access to your data and the business rules. view The view indicates how data from the model will be displayed. It is a set of webpages and user controls that define layout for model data based on user actions such as read, edit, and insert. For example, you might have a view that defines specific layout information for a page that allows a user to edit a Customer object from your model. View tasks do not include the input logic or the processing of user actions; these are managed inside the controller. This separation is what makes the input logic more test-ready for unit testing.

This is code you write to handle the user interaction (often called input logic) and the connection between the model and the view. A controller is a class that inherits from System.Web.Mvc.Controller. It includes logic for processing user events or actions. HTTP requests are routed to individual controllers; the controller responds to the request by calling the model and selecting a view for displaying results.

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Much of the request processing that makes ASP.NET MVC work is found in the System.Web. Routing namespace. This is because much of what happens with requests is done through routing. The UrlRoutingModule HttpModule is found in this namespace; it acts as a frontcontroller for your website. UrlRoutingModule takes a request and looks up a Route object in the RouteTable collection. You add routes to this collection inside the Global.asax file s RegisterRoutes method (which is called by Application_Start). These routes are added to the table when your application starts. The request is then mapped to a route, and RouteData and RequestContext objects are created to represent the route and the request, respectively. Processing of the RequestContext object is then passed to classes in the System.Web.Mvc namespace. The MvcRouteHandler class handles the routing to your MVC controller class. It creates an instance of MvcHandler to actually call the controller and run its Execute method. The controller that the MvcHandler calls is a controller class that you write to handle the processing of requests to your application. Of course, there are several examples later in the chapter.

Must Change Password At Next Logon option is cleared and the Password Never Expires option is selected.

<table width="600" border="0"> <tr> <td align="middle"> <select name="DropDownList1" id="DropDownList1" onchange="__doPostBack( DropDownList1 , )" language="javascript"> <option value="Black"> Select Color </option> <option value="Red">Red</option> <option selected="selected" value="Green">Green</option> <option value="Blue">Blue</option> </select> <br> <br> <span id="Label1" style="color:Green;">You selected Green </span> <br> <br> <br> </td> </tr> </table>

Your controller then uses ControllerActionInvoker to determine which action to run based on the request. Your action method accepts the user input and prepares a response (by using your model and views). Figure 14-2 illustrates this life cycle.

HTTP request Internet Information Services (IIS)

access permission is set to Control Access Through Remote Access Policy and the static route 131.107.250.0 with a subnet mask 255.255.255.0 is added.

2. Create RequestContext instance. 3. Create MvcHandler and pass RequestContext to handler. 4. Identify IControllerFactory from RequestContext. 5. Create instance of class that implements ControllerBase. 6. Call MyController.Execute method.

7. The ControllerActionInvoker determines which action to invoke on the controller and executes the action on the controller, which results in calling the model and returning a view.

<input type="hidden" name="__EVENTTARGET" value="" /> <input type="hidden" name="__EVENTARGUMENT" value="" /> <script language="javascript"> <! function __doPostBack(eventTarget, eventArgument) { var theform = document.Form1;

To define the authentication and encryption settings for business partner VPN connections, the following remote access policy is created:

Be sure to know how the execution life cycle of ASP.NET MVC applications differs from that of ASP.NET.

As you can see, the routing engine routes requests to one of your controller classes. The URL of the request determines the appropriate controller and action to invoke. As an example, suppose that a request is made to http://myMvcApplication/Employees/Detail/5.