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Often, it is just not practical to store your state on the client. Your state might be more involved and thus too large to be transmitted back and forth. Perhaps you have state that needs to be secured and even encrypted and should not be passed around a network. Additionally, you might have state that is not client specific but global to all the users of your application. In all of these scenarios, you still need to store state. If the client is not the right choice, you must look to the server for a state management solution. ASP.NET provides two ways to store state on the server and thus share information between webpages without sending the data to the client. These two methods are referred to as application state and session state. Application state information is global to the application and is available to all pages, regardless of the identity of the user requesting the page. Session state is a user-specific state that is stored by the server. It is available only to pages accessed by a single user during a visit to your site. This lesson explores these two server-side state management techniques.

This code could cause the JIT compiler to not generate any CPU instructions if the host machine has only one CPU . In this case, the native code would be fine-tuned for the host machine; the resulting code is smaller and executes faster .

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logic of a service Use a separate initialization routine to generate any tables required by the service roles This avoids performance degradation through exceptions thrown when a table already exists For sample or demo applications, you can perform the initialization in the OnStart method in the role However, instead of multiple role instances attempting to initialize the storage at the same time in a production environment, it is better to have a separate console application or script to perform the initialization When deleting and recreating tables, ensure you wait for approximately one minute for the existing table to be fully removed or an exception will be thrown when creating a new table with the same name Consider setting the IgnoreMissingProperties property to true for the DataContext you use to access tables.

If the new assembly doesn t fix the original bug, the administrator can delete the binding redirection lines from the configuration file, and the application will behave as it did before . It s important to note that the system allows the use of an assembly that doesn t exactly match the assembly version recorded in the metadata . This extra flexibility is very handy .

By default, this is property is set to false, which means that, when you add new properties to an existing table, existing clients that are not aware of the new property will receive an ADONET Data Services exception When you set IgnoreMissingProperties to true, ADONET Data Services will not throw an exception when the client is not aware of the added properties Although existing clients will not be able to use the added properties, this does allow you to extend the schema of a table and then upgrade clients later.

// This is a reference type (because of class ). class MyRefType : BaseType { RefType refobj; // This field is a reference type. ValType valobj; // This field is a value type. public override Boolean Equals(Object obj) { // Because this isn t null, if obj is null, // then the objects can t be equal. if (obj == null) return false; // If the objects are of different types, they can t be equal. if (this.GetType() != obj.GetType()) return false; // Cast obj to this type to access fields. NOTE: This cast can t // fail because you know that objects are of the same type. MyRefType other = (MyRefType) obj; // To compare reference fields, do this: if (!Object.Equals(refobj, other.refobj)) return false; // To compare value fields, do this: if (!valobj.Equals(other.valobj)) return false; return true; } // Optional overloads of the == and != operators public static Boolean operator==(MyRefType o1, MyRefType o2) { if (o1 == null) return false; return o1.Equals(o2); } public static Boolean operator!=(MyRefType o1, MyRefType o2) { return !(o1 == o2); } } // Objects are equal.

To make the issue of driver signing even more confusing, there are two additional levels of digital signing to consider. For most driver packages, the only file that must be digitally signed is the catalog file, which uses a .cat extension. It lists the files included with the driver package and provides hashed digest numbers that uniquely identify each file and confirm that it has not been tampered with. For drivers that start at boot-up on X64 versions of Windows Vista, the driver file itself must contain an embedded signature. In addition, any device that is used to play back media that uses the Protected Media Path (PMP), such as HD-DVD disks and other formats that use the Advanced Access Content System (AACS) specification, must have a driver that is signed using a PMP-PE certificate. You can verify the contents of a Security Catalog file by double-clicking it in Windows Explorer.

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