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There is currently no way to cancel an outstanding asynchronous I/O-bound operation . This is a feature that many developers would like, but it is actually quite hard to implement . After all, if you request 1,000 bytes from a server and then you decide you don t want those bytes anymore, there really is no way to tell the server to forget about your request . The way to deal with this is just to let the bytes come back to you and then throw them away . In addition, there is a race condition here: Your request to cancel the request could come just as the last byte is being read . Now what should your application do You d need to handle this potential race condition occurring in your own code and decide whether to throw the data away or act on it . Some BeginXxx methods might return an object that implements the IAsyncResult interface, as well as offering some kind of cancel method . In this case, you could cancel the operation . You d have to check the documentation for the BeginXxx method or the class it returns to see whether cancellation is supported .

One of the tasks during data modeling is also to decide which values are allowed for each attribute. As a minimum, you could allow only numbers in a certain column, or allow only dates or text. You can impose additional restrictions, such as by allowing only positive integers or text of a certain maximum length. A set of allowed attribute values is sometimes referred to as a domain. Another common term is datatype (or just type). Each attribute is defined on a certain type. This can be a standard (built-in) type or a user-defined type.

public class ProductMetadata { [Required(ErrorMessage = "ID is required.")] [RegularExpression("[A-Z]{2}[0-9]{4}", ErrorMessage = "Product ID must be 2 capital letters and 4 numbers.")] public object ID; [StringLength(100, ErrorMessage = "Description must be less than 100 chars.")] public object Description; }

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A very common scenario for builds is copying a set of les from one place to another. How can we achieve this with MSBuild There are several ways we will demonstrate in this chapter. Before we discuss how to copy the les, we ll rst take a close look at the Include statement of an item. I have created some sample les shown in the following tree, which we will use for the remainder of the chapter.

Operations engineers tend to love these next three tips As testers, we should try to file the bugs first Tip If operations has to do anything more than double-click an icon and wait for the green light to come back saying the deployment completed successfully, there are still bugs in the deployment code They might be design bugs, but they are still bugs Tip If the deployment guide to operations has any instructions other than, "Go here and double-click this file," there are bugs in the deployment guide Tip If there needs to be more than two engineers in the room to ensure that the deployment is successful, there are design flaws in the deployment code and the deployment guide Fully automated, data-driven deployments are the foundation that unblocks all other testing, and they must be the top priority.

is well tuned so that we do not waste power Producing Higher Efficiency Light Bulbs is a Fine Way to Reduce Power Consumption, but Learning to see in the Dark is Much Better The entire construction and day-to-day operating expense for a datacenter can be thought of as an investment toward delivering power to the equipment housed in the datacenter Under this model, the role of the concrete floor is to deliver power, the role of the HVAC system is to deliver power, and the role of the security personnel is to deliver power Visualize all expenses within the facility as being tracked and delivered by kilowatt inside the datacenter That's how Microsoft thinks about the costs of operating large-scale datacenters, and we spend our time focused on innovation that brings down cost in each generation of datacenter we construct.