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The preceding code is necessarily abbreviated . Go ahead and take a look at machine .config and you ll see the section handlers in their full glory . (On most computers, machine .config is located at C:\Windows\Microsoft .NET\Framework\vxxxxx\Config .) When you look at the configuration handlers, you can see that the sessionState configuration settings are interpreted by an assembly with the strong name System.Web.Configuration.SessionStateSection, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a . A strong name fully specifies the name of an assembly, including a version (to ensure version compatibility) and a public token (to ensure the assembly has not been tampered with) .

It s clear that the application as it stands has a severe security hole that allows it to reveal sensitive information. Of course, we could prevent this by not adding the sensitive information to the exception message. However, the information will be useful to administrators and developers if they need to debug the application. For example, if the data connection had failed or the database contained invalid data, they would have seen this through missing values for the employee name or salary; and they could see if the configuration file contains the correct database connection string. Alternatively, in the case shown here, they can immediately tell that the database returned the required values for the operation, but the user interface allowed the user to enter the value zero for the number of weeks. To provide this extra information, yet apply exception shielding, you may consider implementing configuration settings and custom code to allow administrators to specify when they need the additional information. However, this is exactly where the Exception Handling block comes in. You can set up an exception handling policy that administrators can modify as required, without needing to write custom code or set up custom configuration settings. The first step is to create an exception handling policy that specifies the events you want to handle, and contains a handler that will either wrap (hide) or replace (remove) the exception containing all of the debugging information with one that contains a simple error message suitable for display to users or propagation through the layers of the application. You ll see these options implemented in the following sections. You will also see how you can log the original exception before replacing it, how you can handle specific types of exceptions, and how you can apply exception shielding to WCF services.

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HTML includes the <form></form> opening and closing tags for notifying the browser that a section of HTML includes tags representing controls the user will interact with to eventually return information to the server . You use the <form> tag to specify how a Web document will handle input from the end user (not just output) . The contents of the form, which is to say the data contained in the input controls, are posted back to the server for processing . This action is commonly called a postback . This is why the typical HTTP use case for an HTML document is GET, which initially retrieves the document, and then POST (or a modified form of GET), which returns data to the server, if necessary . The <form> tag usually sandwiches a set of tags specifying user input controls . The following shows the same feature selection page you saw earlier but with the <form> tag added (the code is from the file named SelectFeature2 .htm in sample code on the book s companion CD):

You can use a blocking method call to implement modal interactions in a synchronous way, as shown in the following code example. Examples of this type of interaction are those in which a user is presented with a MessageBox or modal pop-up window to obtain a specific response before execution can continue.

<html> <body> <form action="http://localhost/HttpHandlers/selectfeature2.htm" method="get"> <h2>Hello there. What's your favorite .NET feature </h2> <select name='Feature'> <option> Type-Safety</option> <option> Garbage collection</option> <option> Multiple syntaxes</option> <option> Code Access Security</option> <option> Simpler threading</option> <option> Versioning purgatory</option> </select> <br/> <input type=submit name='Lookup' value='Lookup'></input> <br/> </form> </body> </html>

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