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The code in Listing 12-1 starts by inserting two applicants, each with the path to a resume file that we also created. The goal here is to delete the resume file in a structured way when the instance of the Applicant entity is deleted. We do this by overriding the SaveChanges() method. In our SaveChanges() method, we first gather up all the instances of Applicant that have been marked for deletion. These are the ones that will be deleted from the database when we call the real SaveChanges() method. We need to get them before we call SaveChanges() because after we call SaveChanges(), these instances will be detached from the context and we will no longer be able to use this query to retrieve them. Once we have the instances that will be deleted, we call SaveChanges() to do

Override default DAV port: Use a custom port number (if you had to append a : at the end of a URL to log into the web portal).

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The core physics and geometry that we ve covered so far in this book should be basic knowledge for any serious game designer. Learn it, understand it, practice it, and let it become the currency of your game-design universe. The concepts and math are as useful for making games using AS3.0, as it is for making games with Java, C++, Objective C, or some future programming language yet to be invented. You now have the skills to control the entire geometry of your space and the motion of all your game objects. You are able to handle almost any collision-detection problem that might come up. (Yes, I said almost, because there s one more collision scenario that you still need know about, which we ll look at in the next chapter.) The concepts that we ve covered are so fundamental to game design, in any programming language or medium, that if you want to try your hand at more complex physics, you have this book as a reference to move on to the next level. All the math and concepts that we ve covered have built a solid foundation for you to continue developing your skills. In the next chapter, we re going to start putting these skills to some practical use and learn about how to use bitmaps for pixel-perfect collision and making destructible environments.

the real work of persisting objects to the database. Once the changes have been successfully committed, we can delete the resume files. There are a couple of possible variations worth noting. We could wrap both our call to SaveChanges() and the file deletions in a transaction to ensure that both either succeed or fail together. Another variation is to use the DetectChangesBeforeSave SaveOption in our call to SaveChanges(). This option preserves the tracking information in the object context and would allow us to move the query for deleted objects to somewhere after the call the SaveChanges(). To clear the tracking information, we would need to call AcceptAllChanges() before we leave the method. Entity Framework does not expose insert, update, and delete events for each entity. However, much of what we would do in these events can be handled, as we have demonstrated here, by overriding the SaveChanges() method.

for Global Address List (GAL) lookups. In some cases the Exchange server can be used, although you may need to use a domain controller instead. If lookups are slow for branch offices, consider using a localized global catalog server for that office.

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for a given LDAP query. This is similar to how the Active Directory plug-in returns a maximum number of objects, as described in 3. If you increase this number, lookups for addresses in the GAL could take longer, but you may need to increase it in large organizations if users have search issues.

Let s say you have a model with a User entity. The User entity has properties for the full name and user name for the user. You have a business rule that says each user must have a UserName greater than five characters long. You want to enforce this business rule with code that sets the IsActive property to false if the UserName is set to a string less than or equal to five characters; otherwise the IsActive flag is set to true. The model is shown in Figure 12-2.

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