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If multiple applications are going to access an assembly, the assembly must be placed in a well-known directory, and the CLR must know to look in this directory automatically when a reference to the assembly is detected . However, we have a problem: Two (or more) companies could produce assemblies that have the same file name . Then, if both of these assemblies get copied into the same well-known directory, the last one installed wins, and all of the applications that were using the old assembly no longer function as desired . (This is exactly why DLL hell exists today in Windows, in which shared DLLs are all just copied into the System32 directory .)
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In various chapters throughout this book, I have discussed how the CLR creates an internal data structure for each and every type in use by an application . These data structures are called type objects . Well, a type with generic type parameters is still considered a type, and the CLR will create an internal type object for each of these . This applies to reference types (classes), value types (structs), interface types, and delegate types . However, a type with generic type parameters is called an open type, and the CLR does not allow any instance of an open type to be constructed (similar to how the CLR prevents an instance of an interface type from being constructed) . When code references a generic type, it can specify a set of generic type arguments . If actual data types are passed in for all of the type arguments, the type is called a closed type, and the CLR does allow instances of a closed type to be constructed . However, it is possible for code referencing a generic type to leave some generic type arguments unspecified . This creates a new open type object in the CLR, and instances of this type cannot be created . The following code should make this clear:
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-- Connection 1, Step 4 UPDATE dbo.T1 SET col2 = 'Version 5' WHERE keycol = 2;
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Both Random classes act as number generators, providing a stream of random numbers in response to method calls. Instantiation of both classes is the same except when specifying a seed; java.util.Random takes a long, whereas System.Random takes an int. Once created, the .NET System.Random class cannot have its seed changed, whereas the Java class provides the setSeed method. Java offers greater flexibility in the type of result returned from Random, including support for Boolean values and a wider selection of numeric types. Table 8-6 summarizes the methods of the Java and .NET Random classes.
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<Rectangle x:Name="rect" Fill="Red" Canvas.Top="100" Canvas.Left="100" Width="100" Height="100"> <Rectangle.Triggers> <EventTrigger RoutedEvent="Rectangle.Loaded">
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The first possibility is to have a single table with many additional columns of character data types, such as NVARCHAR(50), and then let your users insert into them any data they want . I really dislike this solution . The names of these additional attributes are typically meaningless . It is not easy to use declarative constraints, because you do not even have proper data types for specific data . You can create triggers for such columns, or try to solve integrity problems in your middle tier or client code . Instead of having dozens of attributes prepared in advance, you can alter the table and add columns as needed . This way you can use proper data types, and also add declarative integrity constraints, such as foreign keys and check constraints . However, this is not a very dynamic solution . Your application must be able to create user interface forms dynamically; otherwise, you would have to upgrade the application for every single change . In both cases, with a single table, you would probably get a very sparse table, meaning many NULLs in your data . This is a logical consequence because not all attributes are applicable for all rows . In addition, a table like this could grow very quickly . You can mitigate the size problem if you use the new SPARSE attribute for nullable columns in SQL Server 2008 . Yet sparse columns solve the size problem only, and cannot help you with constraints or with dynamic forms in application . A proper relational solution would be to implement subtypes . Besides the main Products table, you add additional tables for each product category with a one-to-one relationship to the main Products table and with attributes specific for that category . You leave the common attributes in the main table . This is a very good solution it is in fact considered a good design . You can implement any constraint you need, and you store the data efficiently . Yet this is not a dynamic solution . When a new category arises, you have to create an additional table . Again, your application must be able to use the new table dynamically; otherwise, you would need to upgrade the application after adding a new subtype .
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This chapter provides an essential introductory reference to .NET Framework Web services; for a thorough guide, have a look at Scott Short's Building XML Services for the Microsoft .NET Platform (Microsoft Press, 2002). Concrete examples covering a possible .NET Framework implementation of the mobile code feature can be found in the article "Using an Eval Function in Web Services," in the September 2002 issue of MSDN Magazine. For more information about Web service related standards, here are some useful URLs: You'll find the SOAP specification at The UDDI official Web site is From that Web site, I recommend the "UDDI Executive White Paper," which is available for download at Notes about the WSDL standard can be found at Finally, if you need an introduction to the WS-Security initiative, get a copy of the June 2002 issue of MSDN Magazine and read the "XML Files" column.
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First of all, make sure the new entry you added to config.php is configured correctly. If you re running your web site on a different port than the default of 80 (say, if you re using port 8080), make sure you specify the correct port in the HTTP_SERVER_PORT constant. We also defined a constant named USE_SSL, which specifies whether the site is supposed to generate HTTPS URLs. If the constant is set to no, your site won t generate any HTTPS links even for the places that should normally be secured. Let s see how this works. The code you ve just added to the presentation tier is a Smarty modifier. The Smarty modifier is used as shown by the modifications you ve implemented in header.tpl and departments_list.tpl, and it transforms the relative links received as parameters to absolute links. The prepare_link Smarty modifier takes as parameter the name of the protocol that should be used to generate the links; if http is passed, an HTTP URL will be generated; if https is passed, an HTTPS URL will be generated. Take the example of the link in the header: <a href="{"index.php"|prepare_link:"http"}"> This link will be transformed to an absolute link by our Smarty modifier, which will arrive to the client like this: <a href=""> If you wanted that particular link to be accessed only through HTTPS, then you could use the Smarty modifier like this: <a href="{"index.php"|prepare_link:"https"}"> This modifier would transform the link to <a href=""> Note that if the USE_SSL constant is set to no, then HTTP will be used even if the parameter is https. You can reload the web site to ensure that nothing s broken.
int CompareTo(object obj);
Installing an Apache web server is only difficult if the vanilla installation doesn t work. Debugging a failing Apache service can be time consuming because the server itself will often return vague or misleading error messages. For example, if you install a MySQL plug-in that is incompatible with the installed version of Apache, the error doesn t state this incompatibility. Instead it declares that the plug-in was not found with an error such as the following:
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The developers of the help system in the 2007 release have envisioned Super Tooltips as the missing link between the user interface and the help system. Not only do Super Tooltips provide the expanded descriptions, contextual suggestions, and sometimes even images but they
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