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Public Shared Property ProtectKey() As Boolean Get Return _ProtectKey End Get Set _ProtectKey = Value End Set End Property Public Shared Sub GenerateKey(ByVal targetFile As String) End Sub Public Shared Sub ReadKey(ByVal algorithm As SymmetricAlgorithm, ByVal file As String) End Sub Public Shared Function EncryptData(ByVal data As String, ByVal keyFile As String) As Byte() End Function Public Shared Function DecryptData(ByVal data As Byte(), ByVal keyFile As String) As String End Function End Class The class offers a possibility for specifying the name of the algorithm (DES, TripleDES, RijnDael, or RC2) through the AlgorithmName property. It also supports operations for generating a new key, reading this key from the file specified directly into the key property of an algorithm instance, and encrypting and decrypting data. For using this class, you must set the algorithm name appropriately and then generate a key if none exists already. Then you just need to call the EncryptData and DecryptData methods, which internally will call the ReadKey method for initializing the algorithm. The ProtectKey property allows the user of the class to specify whether the key should be protected through the DPAPI. You can generate encryption keys through the algorithm classes. The GenerateKey method looks like this: Public Shared Sub GenerateKey(ByVal targetFile As String) ' Create the algorithm Dim Algorithm As SymmetricAlgorithm = SymmetricAlgorithm.Create(AlgorithmName) Algorithm.GenerateKey() ' Now get the key Dim Key As Byte() = Algorithm.Key If ProtectKey Then ' Use DPAPI to encrypt key Key = ProtectedData.Protect(Key, Nothing, DataProtectionScope.LocalMachine) End If ' Store the key in a file called key.config Using fs As New FileStream(targetFile, FileMode.Create)

After reading the previous sections, you probably already recognize the many advantages that ORM frameworks and persistence objects offer. We talked about the method save that allows you to insert/update data into the database, avoiding the tedious INSERT or UPDATE SQL statements. Hibernate saves you typing in the tedious SQL, though it allows you to use SQL when necessary. Another benefit of Hibernate is that it never updates the database if the object state hasn t changed. In hand-coded JDBC, it is very common to have to write code to avoid this very problem. When a user presses the submit button on a form, even without making any changes, JDBC doesn t know so it updates the database anyway. Hibernate also provides a very efficient caching system. You can cache persistent objects and enable cluster cache to memory or the local disk. With Hibernate, you can work with different database types just by changing the property dialect. This means you can use your application with a different database by just changing one line of code. Sometimes, however, you will still need to write SQL to retrieve data using complex queries. These are hard to formulate with just the Hibernate filters, so Hibernate offers you a choice. Either you can work with Hibernate's query language (HQL), which allows you to query your persisted objects with a language similar to SQL, or you can revert to standard SQL usage, which forces Hibernate to use normal SQL.

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WCF supports various endpoint and service behaviors. In a nutshell, a behavior allows you to qualify further the functionality of a host, service, or client. This element allows you to fine-tune each of the WCF-supplied bindings (e.g., basicHttpBinding and netMsmqBinding), as well as to specify any custom bindings used by the host. This element contains a list of endpoints a client uses to connect to a service. Obviously, this is not particularly useful in a host s *.config file. This element defines COM contracts enabled for WCF and COM interoperability. This element can only be set within a machine.config file. You can use it to define all of the behaviors used by each WCF service on a given machine.

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