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) In fact, neither you nor your bank really wants this to happen, not least because it s easy enough to imagine similar examples where you lose money This problem of concurrent changes to shared data crops up in all sorts of forms You don t even need to be modifying data to observe a problem: code that only ever reads can still see weird results For example, you might want to count your money, in which case looking at the balances of all your accounts would be necessary that s a readonly operation But what if some other code was in the middle of transferring money between two of your accounts Your read-only code could be messed up by other code modifying the data..

In fact, it gets a good deal cleverer than that. Databases go to some lengths to avoid making clients wait for one another unless it s absolutely necessary, and can sometimes manage this even when clients are accessing the same data, particularly if they re only reading the common data. Not all databases do this in the same way, so consult your database documentation for further details.

Livingston: Did you have a hard time signing up advertisers at first Bhatia: It takes a long time before you can break through to an advertiser and

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A simple way to avoid this is to do one thing at a time as long as each task completes before the next begins, you ll never see this sort of problem. But that turns out to be impractical if you re dealing with a large volume of work. And that s why we have transactions they are designed to make it look like things are happening one task at a time, but under the covers they allow tasks to proceed concurrently as long as they re working on unrelated information. So with transactions, the fact that some other bank customer is in the process of performing a funds transfer will not stop you from using an ATM. But if a transfer is taking place on one of your accounts at the same time that you are trying to withdraw money, transactions would ensure that these two operations take it in turns. So code that uses transactions effectively gets exclusive access to whatever data it is working with right now, without slowing down anything it s not using. This means you get the best of both worlds: you can write code as though it s the only code running right now, but you get good throughput. How do we exploit transactions in C# Example 14-20 shows the simplest approach: if you create a TransactionScope object, the EF will automatically enlist any database operations in the same transaction. The TransactionScope class is defined in the System.Transactions namespace in the System.Transactions DLL (another class library DLL for which we need to add a reference, as it s not in the default set).

Although the history file can be difficult to correlate events to, it is one of the most important items to review..

using (var dbContext = new AdventureWorksLT2008Entities()) { using (var txScope = new TransactionScope()) { var customersWithOrders = from cust in dbContext.Customers where cust.SalesOrderHeaders.Count > 0 select cust; foreach (var customer in customersWithOrders) { Console.WriteLine("Customer {0} has {1} orders", customer.CustomerID, customer.SalesOrderHeaders.Count); } } txScope.Complete();

get them to start paying you. In fact, the first 3 or 4 months we were doing advertising for our advertisers for free. We had them give us their banners, just to show that this was a mechanism for people to get their product in front of millions and millions of consumers. People would ask, So, how are you going to make money And the whole thing about making money was all those pesky ads. Ads were perceived to be kind of a negative. And that s the reason why, when there used to be 25 search engines, only 2 or 3 have survived. The others have died because they made their front pages look like Las Vegas casinos as opposed to preserving that simple, clean interface that Google has. I think the strategy that Google took was far better. They earned the trust of the end consumer.

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For as long as the TransactionScope is active (i.e., until it is disposed at the end of the using block), all the requests to the database this code makes will be part of the same transaction, and so the results should be consistent any other database client that tries to modify the state we re looking at will be made to wait (or we ll be made to wait for them) in order to guarantee consistency. The call to Complete at the end indicates that we have finished all the work in the transaction, and are happy for it to commit without this, the transaction would be aborted at the end of the scope s using block.

Livingston: Did Hotmail ever become profitable from advertising Bhatia: No, we didn t become profitable. But we weren t losing that much

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