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If your class is sealed, then it is highly recommended that you declare this special constructor to be private This will prevent any code from accidentally calling increasing security If not, then you should declare this special constructor as protected so that only derived classes can call it Note that the formatters are able to call this special constructor no matter how it is declared This constructor receives a reference to a SerializationInfo object containing all of the values added to it when the object was serialized The special constructor can call any of the GetBoolean, GetChar, GetByte, GetSByte, GetInt16, GetUInt16, GetInt32, GetUInt32, GetInt64, GetUInt64, GetSingle, GetDouble, GetDecimal, GetDateTime, GetString, and GetValue methods, passing in a string corresponding to the name used to serialize a value The value returned from each of these methods is then used to initialize the fields of the new object .

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. . 1 . . Create a new project . Make it an Empty ASP .NET Web Application named OutputCaching . 2 . . Add a new Web Form to the project . Name it Default .aspx . Microsoft Visual Studio opens the file for you after you create it . Insert the OutputCache directive near the top, immediately after the Page directive . For now, set the Trace attribute to false. (You turn it on later when you cache user controls .) At the very least, the OutputCache directive needs two things: (1) the Duration attribute to be set and (2) the VaryByParam attribute set to none . The Duration attribute specifies how long the content should be cached . The VaryByParam attribute is for managing the caching of multiple versions of the page . You learn more about these attributes shortly . The following code shows the syntax of the OutputCache directive . This example caches the page s content for 15 seconds . The code following the output directive was generated by Visual Studio:

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Listing 1-1 contains a general form of a query, along with step numbers assigned according to the order in which the different clauses are logically processed.

When deserializing an object s fields, you should call the Get method that matches the type of value that was passed to the AddValue method when the object was serialized In other words, if the GetObjectData method called AddValue, passing it an Int32 value, then the GetInt32 method should be called for the same value when deserializing the object If the value s type in the stream doesn t match the type you re trying to get, then the formatter will attempt to use an IFormatterConvert object to cast the stream s value to the desired type As I mentioned earlier, when a SerializationInfo object is constructed, it is passed an object whose type implements the IFormatterConverter interface Since the formatter is responsible for constructing the SerializationInfo object, it chooses whatever IFormatterConverter type it wants Microsoft s BinaryFormatter and SoapFormatter types always construct an instance of the SystemRuntimeSerialization.

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PATH A PATH secondary XML index is especially useful if your queries specify path expressions . It speeds up the exist method better than the Primary XML index . Such an index also speeds up queries that use value for a fully specified path . VALUE A VALUE secondary XML index is useful if queries are value-based and the path is not fully specified or it includes a wildcard . PROPERTY A PROPERTY secondary XML index is very useful for queries that retrieve one or more values from individual XML instances using the value method .

Delegations take precedence over forwarding. If, in the preceding example, the server authoritative for the microsoft.com domain were configured to forward to all queries that it could not answer, the server would still answer a query for the name box.exam] ple.microsoft.com by contacting ns1.us.example.microsoft.com, not by contacting the forwarder specified on the Forwarders tab.

FormatterConverter type Microsoft s formatters don t offer any way for you to select a different IFormatterConverter type The FormatterConverter type calls the SystemConvert class s static methods to convert values between the core types, such as converting an Int32 to an Int64 However, to convert a value between other arbitrary types, the FormatterConverter calls Convert s ChangeType method to cast the serialized (or original) type to an IConvertible interface and then calls the appropriate interface method Therefore, to allow objects of a serializable type to be deserialized as a different type, you may want to consider having your type implement the IConvertible interface Note that the FormatterConverter object is used only when deserializing objects and when you re calling a Get method whose type doesn t match the type of the value in the stream .

When you build and run this code, the following output appears:

6. On the Security Methods page, select a security method and click Edit. 7. Click Custom and click Edit; then click Settings. 8. Change the Encryption algorithm from 3DES to DES. 9. Click OK twice, and then select any remaining security methods (Figure 11-41) and change their encryption algorithms from 3DES to DES. Click OK twice.

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