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After an assembly is deployed to the GAC, it can be used by other assemblies in the system. Remember, however, that an assembly s identity consists of all four parts of the fully qualified name. So, if the version number of a library changes, or if it has a different public key, these differences specify different assemblies. The result is that there can be many different assemblies in the GAC that have the same filename. Although they have the same filename, they are different assemblies and coexist perfectly fine together in the GAC. This makes it easy for different applications to use different versions of the same DLL at the same time, since they are different assemblies with different identities. This is called side-by-side execution. Figure 10-16 illustrates four different DLLs in the GAC that all have the same filename MyLibrary.dll. Looking at the figure, you can see that the first three come from the same company, because they have the same public key, and the fourth comes from a different source, since it has a different public key. These versions differ as follows: An English version 1.0.0.0, from company A An English version 2.0.0.0, from company A A German version 1.0.0.0, from company A An English version 1.0.0.0, from company B

Configuration files contain information about the application, for use by the CLR at run time They can instruct the CLR to do such things as use a different version of a DLL, or to look in additional directories when searching for a DLL referenced by the program Configuration files consist of XML code and don t contain C# code The details of writing the XML code are beyond the scope of this text, but you should understand the purpose of configuration files and how they are used One way they are used is to update an application assembly to use the new version of a DLL Suppose, for example, that you have an application that references a DLL in the GAC The identity of the reference in the application s manifest must exactly match the identity of the assembly in the GAC.

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Figure 10-11. Our service map for Test 1 One thing to note: if a supplier was able to use the data format provided by your enterpriselevel service, then that could be an entry point into your enterprise. It s an architectural decision as to whether or not to publish enterprise-level services directly to your suppliers. Our personal preference is to isolate partner and supplier integration within their respective domains, and keep the ESL as a resource solely for the use of the enterprise itself. Last, we took a top-down approach to this. We worked from the business need, not from a technical improvement.

PreparedStatement stmt = connection.prepareStatement( "UPDATE BOOK SET BOOK_NAME = WHERE ISBN = "); stmt.setString(1, "Hibernate Quickly 2nd Edition"); stmt.setString(2, "1932394419"); int count = stmt.executeUpdate(); System.out.println("Updated count : " + count); stmt.close();

If a new version of the DLL is released, it can be added to the GAC, where it can happily coexist with the old version The application, however, still has embedded in its manifest the identity of the old version of the DLL Unless you recompile the application and make it reference the new version of the DLL, it will continue to use the old version That s fine, if that s what you want If, however, you do not want to recompile the application but want it to use the new DLL, then you can create a configuration file telling the CLR to use the new version rather than the old version The configuration file is placed in the application directory Figure 10-17 illustrates objects in the runtime process The MyProgramexe application on the left calls for version 1000 of the MyLibrary.

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