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The distribution of types across DLLs in the class library is driven by a combination of efficiency requirements and history. The System.Core library is a good example of the latter. There is no System.Core namespace this library defines types in numerous namespaces including System, System.IO, and System.Threading. But you ll also find types in these same three namespaces in the System library and also a library called mscorlib. (All .NET programs have a reference to mscorlib, and since it s mandatory, Visual Studio doesn t show it in the Solution Explorer. It s where critical types such as System.String and System.Int32 are defined.) One of the reasons System.Core exists as a separate DLL is that it first appeared in version 3.5 of .NET. With versions 3.0 and 3.5 of .NET, Microsoft chose to put completely new functionality into new DLLs rather than altering the DLLs that were provided in version 2.0. This packaging decision choosing which types go in which DLLs was independent from the conceptual decision of which types belong in which namespaces. History doesn t explain the whole story, though. Even the very first version of .NET split its namespaces across multiple libraries. One common reason for this was to avoid loading code that is never used. You wouldn t want a desktop application to waste time and memory by loading the libraries for building web applications. In some cases,

SQL still requires server permissions at the table level, which some database administrators (DBAs) are reluctant to allow. Also, stored procedures allow the DBA to control the data access and customize

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Read uncommitted This is the lowest level of isolation, and is really no isolation at all. It will read data from a table, even if it is the result of an incomplete transaction. Hence, in our example, this isolation level would result in 85 being returned. Read committed This level of isolation prevents uncommitted data from being returned. However, within a transaction, if rows are selected there is nothing stopping those rows from being modified by another user, even before the transaction is complete. This means that if the same rows are queried once at the beginning of the transaction and once at the end, they aren t guaranteed to be the same. Repeatable read This level ensures that only committed data will be read, and in addition will acquire read-locks on queried rows to prevent them from being modified by another user before the end of the transaction. However, this level of protection depends completely on the type of query used. If the query contains a range clause (e.g., BETWEEN), a range lock will not be acquired, and therefore the rows may be changed by another user

We re almost ready to build the final version of the Poker DLL, which serves as the engine at the heart of the different poker applications in the remainder of the book. Before we do this, we create a simple helper class called Bet, which provides a convenient way to check the validity of placed bets and is shown in listing 4.14.

Generic arguments can also be prefixed with the in keyword, meaning that the type is only ever passed in, and will never be returned. The IComparable<T> interface we saw earlier happens to work this way. In this case, we say that IComparable<T> is contravariant with T it works the other way around. You cannot pass an IComparable<Train eeFirefighter> to a method expecting an IComparable<FirefighterBase>, because that method might pass in a different kind of FirefighterBase, such as Firefighter. But you can pass an IComparable<FirefighterBase> to a method expecting an ICompara ble<TraineeFirefighter> (even though you cannot pass a FirefighterBase to a method expecting a TraineeFirefighter). An IComparable<FirefighterBase> is capable of being compared to any FirefighterBase, and is therefore able to be compared with a TraineeFirefighter. By default, generic arguments are neither covariant nor contravariant. C# 4.0 introduced support for variance because the absence of variance with collection interfaces just seemed wrong IEnumerable<T> now works like most developers would expect.

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