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The behavior of an ASP.NET application is affected both by system-level settings and by the characteristics of the application itself. When running, the application obtains a map of the current system settings from the system s machine.config file, and then it applies those settings to any changes that the application requires. The machine.config file contains default and machinespecific values for all supported settings. Machine settings are normally controlled by the system administrator, and applications should not be given write access to it. Because the machine.config file is outside the Web space of the application, it cannot be reached even if an attacker succeeds in injecting malicious code into the system. An application can override most of the default values stored in the machine.config file by creating one or more web.config files. At a minimum, an application creates a web.config file in its root folder. The web.config file is a subset of machine.config, written according to the same XML schema. Although web.config allows you to override some of the default settings, you cannot override all settings defined in machine.config. In particular, the information about the ASP.NET process model can be defined only in a machinewide manner using the machine.config file. If the application contains child directories, it can define a web.config file for each folder. The scope of each configuration file is determined in a hierarchical, top-down manner. The settings actually applied to an application and thus its Web pages is determined by the sum of the changes that the various web.config files in the hierarchy of the application carry. Along this path, any of

CREATE INDEX idx_cid_od_i_eid_oid ON Sales.Orders(custid, orderdate) INCLUDE(empid, orderid);

The first solution I ll present is one where I use a CTE to calculate the maximum order date per customer, and then in the outer query join the Orders table with the CTE to return the orders with the maximum order date for each customer, like so:

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Many years ago, a program error or crash caused by using bad data resulted in a response from a developer such as, "A user would never do that" I once accidentally renamed an application with a file name extension used by the application's document files Opening this file in the application caused a crash that was resolved as "won't fix" because it "was not a user scenario" The bug existed for many years but was finally fixed during a large security push by Microsoft teams around 2002 In fact, one of the great things that has happened because of the enormous emphasis on security at Microsoft is that far fewer bugs found by falsification tests are resolved as "the customer would never do that.

those web.config files can extend, restrict, and override any type of settings defined at an upper level, including the machine level, unless the setting is restricted to a certain level (such as process model). If no configuration file exists in an application folder, the settings valid at the upper level are applied.

WITH CustMax AS ( SELECT custid, MAX(orderdate) AS mx FROM Sales.Orders GROUP BY custid ) SELECT O.orderid, O.orderdate, O.custid, O.empid FROM Sales.Orders AS O JOIN CustMax AS M ON O.custid = M.custid AND O.orderdate = M.mx;

Here the fact that a table expression is not materialized rather its definition gets expanded is an advantage . You might expect SQL Server to scan the data twice once to process the inner reference to the Orders table in the CTE query, and another for the outer reference to the Orders table . But the optimizer figured out a way to handle this query by scanning the data only once, which is truly admirable . Figure 7-6 shows the execution plan the optimizer produced for this query .

In previous versions of ASP.NET, you can access configuration information by using the ConfigurationSettings class. But you can only read the current settings, and only using a weakly typed approach. More important, although in theory you can use the class to read any settings, you can actually use it only for application-specific settings and custom sections. For example, consider the code that would be necessary in ASP.NET 1.1 to read the value of the EnableVersionHeader attribute in the <httpRuntime> section (which determines whether an ASP.NET-specific header containing version information should be added to all responses):

FiguRe 7-6 Execution plan for a solution to the recent orders exercise (using a CTE and join)

" The Happy Path Should Always Pass I arrived at work one morning to see an e-mail message from Adam, a software developer on my team, saying that he had checked in code for the new component he was working on over the weekend and that he would like me to do some ad-hoc testing as soon as the build came out My schedule was tight, but I was excited about finally being able to test the component In fact, I had already written down a few dozen test cases I wanted to try out based on the discussions we had had during the design review Later that morning, the build was released to the test team and I installed the application on my test computer I immediately went to the portion of the application containing Adam's new functionality, entered some data, and clicked one of the buttons.

The Index Seek operator against the index you just created seeks the last entry in the leaf of the index, and then starts scanning the leaf level backward . The Segment operator segments the rows by customer, and the Top operator filters only the rows with the maximum order date per customer . This is a very efficient plan that requires scanning the index you created earlier only once, in order . STATISTICS IO reports 3,231 reads, which is close to the number of pages in the leaf of the index .

object o = ConfigurationSettings.GetConfig( system.web/httpRuntime );

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