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We then complete the original transaction by calling the Complete method on it Of course, as always, we reset the database at the end of the code Here are the results of Listing 175: Let's try to update LAZYK's ContactName with ADONET Please be patient, we have to wait for timeout .. Executing SQL statement against database with ADONET .. Exception occurred trying to update LAZYK with ADONET: Timeout expired The timeout period elapsed prior to completion of the operation or the server is not responding The statement has been terminated Customer Contact Name: Viola Sanders Executing SQL statement against database with ADONET .. Database updated Notice that when we attempt to update the database with ADONET, a timeout exception occurs Don t get fooled by deferred query execution Remember that many of the LINQ operators are deferred.

Many of the guidelines previously mentioned for classes also apply to methods. For example, methods should be loosely coupled and strongly cohesive, with each method having a single responsibility that can be easily described, and should be independent of other methods as much as possible. One indication that a method may not be cohesive is the existence of many levels of code blocks, which are easy to identify if the blocks are properly indented. For example: public void doSomethingComplex(int a, int b, Object c, int d) { if (a < b) { if (c instanceof Number) { for (int i = 0; i < count; i++) { if (getSomeData(i) == null) { while (d < 5) { if (d == 0) { handleSpecialCase(); } } } } } } } It s sometimes necessary to create such complex logical constructs. However, it s never necessary to include the entire construct in a single method, and splitting it into two or more methods can make the code much easier to understand. Most people find it difficult to follow more than a few levels of logic and would probably find the following implementation more readable: public void doSomethingComplex(int a, int b, Object c, int d) { if (a < b) { if (c instanceof Number) { for (int i = 0; i < count; i++) { doPartOfSomethingComplex(i, d); } } } }

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In the case of this example, our LINQ to SQL query is calling the SingleOrDefault operator, so the query is not deferred, thereby requiring that the query must be declared inside the scope of the TransactionScope object Had we not called the SingleOrDefault operator, that query could have been declared before the creation of the TransactionScope object, as long as the actual query got.

public void doPartOfSomethingComplex(int i, int d) { if (getSomeData(i) == null) { while (d < 5) { if (d == 0) { handleSpecialCase(); } } } } Although this may not be the best implementation for these methods, it illustrates that by separating pieces of functionality from a method, you can make its responsibilities simpler and clearer. In addition to greater clarity, structuring your code this way can also make it easier to enhance and debug. One basic but extremely important point worth mentioning concerning method design is the use of an obscure, complex algorithm when a simpler alternative exists. Although the more complicated approach may provide minor benefits such as slightly faster execution, that advantage is usually outweighed by the added complexity involved in maintenance and debugging of the code. Stated more simply, readability, extensibility, and reliability are important, and you should be hesitant to sacrifice those qualities for an algorithm that seems elegant and clever unless doing so provides some important advantage to your application.

string[] presidents = { "Adams", "Arthur", "Buchanan", "Bush", "Carter", "Cleveland", "Clinton", "Coolidge", "Eisenhower", "Fillmore", "Ford", "Garfield", "Grant", "Harding", "Harrison", "Hayes", "Hoover", "Jackson", "Jefferson", "Johnson", "Kennedy", "Lincoln", "Madison", "McKinley", "Monroe", "Nixon", "Obama", "Pierce", "Polk", "Reagan", "Roosevelt", "Taft", "Taylor", "Truman", "Tyler", "Van Buren", "Washington", "Wilson"}; IEnumerable<string> items = presidents.Where(p => p.StartsWith("A")); foreach(string item in items) Console.WriteLine(item); The query using the Where operator is not actually performed when the line containing the query is executed. Instead, an object is returned. It is during the enumeration of the returned object that the Where query is actually performed. This means it is possible that an error that occurs in the query itself may not get detected until the time the enumeration takes place.

The Filters tab allows for a handful of broadly scoped breakpoints to be set during a capture. Figure 7 27 shows these options, including breaking on all HTTP POST requests, breaking on HTTP GET requests containing a query string, and breaking on a response whose content type matches a specified string.

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