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CriteriaBase, in which case the business object type would be specified in the constructor However, the CriteriaBase option is designed primarily for use by code generation tools, and so the nested class approach is used here: [Serializable()] private class Criteria { private Guid _id; public Guid Id { get { return _id; } } public Criteria(Guid id) { _id = id; } } Notice that the class is marked with the [Serializable()] attribute, so the data portal can transfer the object from the client to the server as needed To make the factory methods easier to implement, this class includes a constructor that accepts the criterion as a parameter That value is stored within the object and is exposed as a read-only property The DataPortal_XYZ methods will make use of this property value to interact with the appropriate data in the database.

Whether you re running an entire data center or hosting a website on a dedicated server at a hosting company, maintaining the operating system is usually your responsibility. Maintenance tasks can include managing antivirus protection, installing Windows updates, applying service packs, and providing security. If you re running your own dedicated machine on your own premises rather than it being hosted for you, then you re even responsible for performing backups. In Windows Azure, because the tasks associated with maintaining the server are the responsibility of Microsoft, you can focus completely on your application. This situation greatly simplifies and reduces the cost of running a service. A final cost consideration is that if you have a service hosted in Windows Azure, you don t have to worry about the licensing costs for the underlying operating system. You gain all the benefits of running under the latest version of Windows without paying for the costs of maintaining that software. The underlying software is abstracted away from your service, but the base underlying operating system of your service is Windows Server 2008. If you re running multiple servers, the cost of licensing usually runs into thousands of dollars. Although you don t have to worry about hardware or software maintenance from an operational or cost perspective, you do have to worry about it from a software design perspective.

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With the Criteria class defined, let s move on to discuss the DataPortal_XYZ methods themselves In this sample application, the data access code is relatively straightforward Keep in mind, however, that these routines could be much more complex, interacting with multiple databases, merging data from various sources, and doing whatever is required to retrieve and update data in your business environment..

to take the hit on index creation the first time you do a query that may take advantage of the index, you would use IndexModeOnDemand. The IndexModeNever option is provided to mark cases in which you want to ensure that indexes are never created on a field. Table 14-1 summarizes the parameters of the Indexable attribute.

management service to spin up the new instance. The total time it took in this instance was about 4 minutes. This might seem like a lot of work. Couldn t Azure do all this for you automatically

If you pass a mobile object by reference, you must always make sure to update all references to use the new version of the object when the method call is complete.

Many people wonder why Azure doesn t auto-scale for them There are a couple of reasons, but they all fall into the My kid sent 100,000 text messages this month and my cell phone bill is over a million dollars category The first challenge for Azure with auto-scaling your application is that Azure doesn t know what it means for your system to be busy Is it the depth of the queue Which queue Is it the number of hits on the site Each system defines the status of busy different than any other system does There are too many moving parts for a vendor such as Microsoft to come up with a standard definition that ll make all its customers happy Another reason is that Microsoft could be accused of too aggressively scaling up, and not scaling down fast enough, just to increase the charges on your account.

Load an index only when needed. Always load and maintain an index for this property. Never create an index for this property.

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