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Each XXXCommand property is a string that contains the SQL text to be used. The command can optionally contain parameters listed in the associated parameter collection. The way the commands are executed depends on the selected managed provider. The managed provider and its underlying relational engine determine the exact syntax of the SQL to use and the syntax of the embedded parameters. For example, if the data source control points to SQL Server, command parameter names must be prefixed with the @ symbol. If the target data source is an OLE DB provider, parameters are unnamed, identified with a placeholder symbol, and located by position. The following code snippet shows a more complex data source control in which parametric delete and update commands have been enabled:
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The rst step in creating a disaster recovery plan is to identify the risks to your business and the costs associated with those risks. The risks vary from the simple deletion of a critical le to the total destruction of your place of business and its computers. To properly prepare for a disaster, you need to perform a realistic assessment of the risks, the potential costs and consequences of each disaster scenario, the likelihood of any given disaster scenario, and the resources available to address the risks. Risks that seemed vanishingly remote a few years ago are now part of our everyday lives. Identifying risks is not a job for a single person. As with all the tasks associated with a disaster recovery plan, all concerned parties must participate. There are two important reasons for this: You want to make sure that you have commitment and buy-in from the parties concerned, and you also want to make sure you don t miss anything important. No matter how carefully and thoroughly you try to identify the risks, you ll miss at least one. You should always account for that missing risk by including an unknown risk item in your list. Treat it just like any other risk: Identify the resources available to address it and develop countermeasures to take should it occur. The difference with this risk, of course, is that your resources and countermeasures are somewhat more generic, and you can t really test your response to the risk, because you don t yet know what it is. Start by trying to list all the possible ways that your system could fail. Solicit help from everyone with a stake in the process. The more people involved in the brainstorming, the more ideas you ll get and the more prevention and recovery procedures you can develop and practice. Be careful at this stage in the process to not dismiss any idea or concern as trivial, unimportant, or unlikely. Next, look at all the ways that some external event could affect your system. (The current buzzword for this is threat modeling, if you care.) The team of people responsible for identifying possible external problems is probably similar to a team looking at internal failures, but with some important differences. For example, if your business is housed in a large commercial of ce building, you ll want to involve that building s security and facilities groups even though they aren t employees of your business. They will not only have important input into the possible threats to the business, but also they ll also have information on the resources and preventative measures already in place. The risk identi cation phase is really made up of two parts identi cation and assessment. They are different tasks. During the identi cation portion of the phase, you need to identify every possible risk, no matter how remote or unlikely. No risk suggested should be regarded as silly don t limit the suggestions in any way. You want to identify every possible risk that anyone can think of. Then, when you have as complete a list as you can create, move on to the assessment task. In the risk-assessment task, you will try to understand and quantify just how likely a particular risk is. If you re located in a oodplain, for example, you re much more likely to think ood insurance is a good investment.
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there s no way to get the return values for all of the callback methods called . But this isn t the only limitation . What happens if one of the invoked delegates throws an exception or blocks for a very long time Because the algorithm invoked each delegate in the chain serially, a problem with one of the delegate objects stops all of the subsequent delegates in the chain from being called . Clearly, this algorithm isn t robust . For those scenarios in which this algorithm is insufficient, the MulticastDelegate class offers an instance method, GetInvocationList, that you can use to call each delegate in a chain explicitly, using any algorithm that meets your needs:
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n Note Experienced programmers might wonder why there s no semicolon at the end of the previous code
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In the Network Connections folder, Windows automatically creates generic names for every connection Local Area Connection, for instance . Get in the habit of renaming all connections in this folder with descriptive names . The names you assign will appear in Windows Task Manager graphs, notification area icons, status dialog boxes, and any other place where you can expect to see information about connections . Descriptive names make it much easier to troubleshoot, especially when you have multiple connections active .
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Testing the Effect of Permissions
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Configuring and Managing Remote Access
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c. Incorrect: This call creates your class without inheritance. To extend a DOM element, you
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You can also use RegexIsMatch in a CHECK constraint . For example, the following code creates the table TestRegex with a CHECK constraint that limits the values of the jpgfilename column to filenames with the extension jpg:
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3. You would implement the IHttpAsyncHandler interface, which would include the
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3. Rick selects Litware from the list and then Adatum s FP redirects him to the Litware issuer to verify that Rick is who he says he is. 4. Litware s IP veri es Rick s credentials and returns a security token to Rick s browser. The browser sends the token back to the FP. The claims in this token are con gured for the Adatum FP and contain information about Rick that is relevant to Adatum. For example, the claims establish his name and that he belongs to the sales organization. The process of verifying the user s credentials may include additional steps such as presenting a logon page and querying Active Directory or, potentially, other attribute repositories. 5. The Adatum FP validates and reads the security token issued by Litware and creates a new token that can be used by the a-Order application. Claims issued by Litware are transformed into claims that are understood by Adatum s a-Order application. (The mapping rules that translate Litware claims into Adatum claims were determined when Adatum con gured its issuer to accept Litware s issuer as an identity provider.) 6. As a consequence of the claim mappings, Adatum s issuer removes some claims and adds others that are needed for the a-Order application to accept Rick as a user. The Adatum issuer uses browser redirection to send the new token to the application. WIF validates the security token and extracts the claims. It creates a ClaimsPrincipal and assigns it to HttpContext.User. The a-Order application can then access the claims for authorization decisions. For example, in this scenario, orders are ltered by organization, which is provided as a claim. Adatum s issuer, acting as an FP, mediates between the application and the external issuer. You can think of this as a logical role that the Adatum issuer takes on. The FP has two responsibilities. First, it maintains a trust relationship with Litware s issuer, which means that the FP accepts and understands Litware tokens and their claims.
Inside Microsoft SQL Server 2008: T-SQL Querying
Description
Figure 7-1 : An illustration of the interactions between a Web client browser and a Web server After the browser gets all the information it needs to display and format the page, the user can interact with the page, filling in fields, selecting items from list boxes, and so on. All this work is done without any interaction between the client and the server. When the user clicks the submit button, the form data is submitted to the server. One result of this lack of connection is the frustrated new ASP.NET user wanting to pop up a message box on the client machine. Fortunately, virtually all browsers these days do support client-side scripting. Note Although it s possible in some circumstances to use Visual Basic Scripting Edition (VBScript) on the client side, none of the ASP.NET components do so, and I won t do so in any of the examples in this chapter. Instead, I ll use JScript, Microsoft s implementation of JavaScript. Tip JavaScript and JScript have been rechristened, at least in the ASP.NET documentation, as ECMAScript. This name doesn t have quite the same ring as JavaScript or JScript, but it does reflect the variant that is designed to be cross-browser compatible. You ll find more details on the ECMAScript scripting language at http://www.ecma.ch/ecma1/STAND/ECMA262.HTM. Browsers continue to use JavaScript or JScript as the value for the Language attribute in <SCRIPT> tags. Only a couple of standard HTML controls will initiate a return trip to the server the submit button and a hyperlink are two such controls that come to mind. It s not an accident that only a limited number of controls initiate interactions with the server. As you ll see in this chapter, it s possible to create a control other than a submit button or a hyperlink that will initiate a round-trip to the server. To create such a control, you need to use client-side JavaScript. For example, using client-side JavaScript, you could initiate a round-trip to the server when the user exits a drop-down list. Generally this isn t a good idea, because it will be a greater burden on the server. However, sometimes causing a postback is appropriate; knowing when to cause one is something you can learn with experience. On lightly used intranet applications, the increased server burden might be worth the richer user interface that the greater server interactions can provide. On a busy Internet site, the burden is most often not worth it, because the round-trip to the server would make the application less responsive for the user. One of the problems with using client-side JavaScript is that rather than executing in the warm cocoon of the server, the code executes out in the cold cruel world of the client s browser. One of the reasons server-based computing has become so popular is that it s
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