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All while statements should terminate at some point. A common beginner s mistake is forgetting to include a statement to cause the Boolean expression eventually to evaluate to false and terminate the loop, which results in a program that runs forever. In the example, the i++ statement performs this role. Note The variable i in the while loop controls the number of iterations that it performs. This is a

game content items as they are requested by name. These content items are sometimes referred to as assets. In the same way that a company has assets such as buildings, machinery, and staff, a game has assets such as sounds and images.

Tip The benefit of basing the new calendar on the Standard calendar is that all the working day exceptions from the Standard calendar, such as national holidays you may have entered, will also appear in the new calendar.

Visit the test site. Click the Click here! button. Enter a valid user name and invalid password, and then click Logon.

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Analysis Services always stores information about database objects cubes, partitions, dimensions, for example in data files on the server. You can think of this layer of information as a map. For each partition in a cube, though, you decide where to store the detail and aggregated values. You can choose from three physical storage options: ROLAP, HOLAP, and MOLAP.

Get Data From Aggregation Get Data From Cache Query Cube Begin Query Cube End Query Subcube Verbose

Using Network Load Balancing with routers If Network Load Balancing clients are accessing a cluster through a router, be sure that the router is configured properly. For unicast clusters, the router should accept a dynamic Address Resolution Protocol (ARP) reply that maps the unicast IP address to its unicast MAC address. For multicast clusters, the router should accept an ARP reply that has a MAC address in the payload of the ARP structure. If the router isn t able to do this, you can also create a static ARP entry in the router to handle these requirements. Some routers will require a static ARP entry because they do not support the resolution of unicast IP addresses to multicast MAC addresses.

Liskov s principle can be difficult to grasp for many developers. An easier way to explain it is the following: each derived class should expect no more than the parent and provide no less than the parent. This means, for example, that you break the principle if a virtual member ends up using a private member of the class. Likewise, you break the principle if a derived class adds more preconditions to a virtual method. Liskov s principle isn t meant to portray inheritance a pillar of OOP in a bad light. Quite the reverse, it calls your attention to a safe use of virtual members. If you derive and just add new features, you re absolutely safe. If you don t have virtual members, you re absolutely safe. If you have virtuals and actually override them in derived class, you should pay additional attention. Note In .NET 4, you have the Code Contracts API to express preconditions, postconditions, and invariants around your classes. A precondition is simply an IF in a method that executes at the very beginning of the code. If you use this API to express preconditions for the methods of a class, and happen to add preconditions to an overridden method of a class, you get a warning (not an error) from the C# compiler.

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Because the DataSet is just a client-side repository of data and is physically discon nected from any data source, operations you perform on the DataSet, its tables, and its rows aren t reflected in the data source you used to fill it, at least not automatically, as happens with ADO keysets and dynamic recordsets. (I ll discuss how to update a database from a DataSet later in this chapter.) I mentioned in the preceding section that when you delete a row, you re actually mark ing it for deletion, but the row is still in the DataTable. You can test the current state of a DataRow object by querying its RowState property, which can return one of the follow ing values: Detached (the row has been created but hasn t been added to a DataTable), Added (the row has been added to a DataTable), Modified (the row has been updated), Deleted (the row has been deleted), and Unchanged (the row hasn t been modified).

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