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Compilation modes produce code suited for different situations. The CLR compilation mode may be set in the IDE with the Common Language Runtime support property in the General tab of the Project Properties dialog. Unless specifically noted, the examples in this book will compile with the /clr:pure and /clr:safe options.
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ASP.NET is a mature platform on which to build web applications, and it is probably fair to say that most of the changes in this release are enhancements and tweaks. However, don t skip this chapter, because Microsoft has fixed a number of long-term omissions and introduced some very welcome changes.
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5 will include a NameValueListBase class designed specifically to handle name/value lookup data.
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Caution Using the goto statement is strongly discouraged, as it can lead to code that is poorly structured, and difficult to debug and maintain. Edsger Dijkstra s 1968 letter to the Communications of the ACM, entitled Go To Statement Considered Harmful, was an important contribution to computer science; it was one of the first published descriptions of the pitfalls of using the goto statement.
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To have one constructor call another, you place a colon (:) after the parameter list and then use the this keyword, which is illustrated in Figure 9-3.
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Figure 11-9. The price history pane
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Authorization supports the idea that each business object property and method can have a list of roles that are allowed and denied access. I already touched on some of these concepts when I discussed how properties are declared in 7. Behind the scenes, those methods make use of an AuthorizationRules object from the Csla.Security namespace. Every business object that uses authorization rules has an associated AuthorizationRules object that manages the list of roles associated with each property and method. The AuthorizationRules class also maintains a list of roles allowed to create, get, update, and delete each business object type. To do this work, AuthorizationRules relies on a number of other classes. Table 12-2 lists the types required for authorization.
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You have seen the Main method used in most of the examples. The Main method is the entry point for most kinds of C# program, meaning that this is where the runtime starts to execute your program statements. Code library projects don t need a Main method, for example. Listing 9-38 demonstrates the Main method. Listing 9-38. The C# Main Method using System; class Listing 38 { static void Main() { Console.WriteLine("Main method"); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } There can be only one Main method in a C# program. The Main method is always static, and it can return void or an int value. (A value of zero is usually used to indicate that a program ran successfully, and a value of one represents an error; this is convention, but you can use any values you like.) The .NET runtime runs your program by calling your Main method and executing the statements it contains. For the simple example in Listing 9-38, the only statements are a series of calls to the System.Console class. Compiling and running the code in Listing 9-38 produces the following output: Main method Press enter to finish
Figure 6-6. This dialog box allows you to connect properties to elements of your workflow.
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