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Data caching is the most flexible type of caching, but it also forces you to take specific additional steps in your code to implement it The basic principle of data caching is that you add items that are expensive to create to a built-in collection object called Cache Cache is a property of the Page class, and it returns an instance of the SystemWebCachingCache class This object works much like the Application object you saw in 11 It s globally available to all requests from all clients in the application But it has three key differences: The Cache object is thread-safe: This means you don t need to explicitly lock or unlock the Cache object before adding or removing an item However, the objects in the Cache object will still need to be thread-safe themselves.

99', 'Solid State') Although inserting data without specifying a list of columns is perfectly valid, it makes more sense to name the columns As with the SELECT query, specifying the columns makes the query slightly quicker and shows which columns you re trying to affect With the INSERT query, it also avoids putting data in the wrong column if columns have been added to or removed from the table..

In this chapter, you ll create a new role named Administrators, which will have the privilege to access the web site administration pages. You ll add new roles in the following chapters. The username and password combinations can be saved in various formats and can be physically stored in different places. ASP.NET stores the passwords in hashed form by default.

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For example, if you create a custom business object, more than one client could try to use that object at once, which could lead to invalid data You can code around this limitation in various ways one easy approach that you ll see in this chapter is to just make a duplicate copy of the object if you need to work with it in a web page Items in the Cache object are removed automatically: ASPNET will remove an item if it expires, if one of the objects or files it depends on changes, or if the server becomes low on memory This means you can freely use the cache without worrying about wasting valuable server memory, because ASPNET will remove items as needed.

But because items in the cache can be removed, you always need to check whether a cache object exists before you attempt to use it Otherwise, you could generate a null reference exception Items in the cache support dependencies: You can link a cached object to a file, a database table, or another type of resource If this resource changes, your cached object is automatically deemed invalid and released..

Note One point to remember about INSERT is that it works with only a single table at a time. If you re

You can insert an object into the cache in several ways. You can simply assign it to a new key name (as you would with the Session or Application collection):

Hashing is a common method for storing passwords. The hash value of a password is calculated by applying a mathematical function (hash algorithm) to it. The essential property about the hash algorithm is that you can t obtain the original password from its hash value (the algorithm is one-way). Hashing is different from encryption in that it can t be undone, whereas encrypted data can be decrypted given the correct decrypt key is known. With hashing, even if some unauthorized person gets access to the

However, this approach is generally discouraged because it doesn t give you any control over the amount of time the object will be retained in the cache. A better approach is to use the Insert() method. The Insert() method has four overloaded versions. The most detailed one requires five parameters:

working with complex data that would be sourced from two or more tables in a database, you ll need to write an INSERT query for each table to be updated. For example, to add details for a new Player to the sample database, you would have to write an INSERT query for both the Player table and the WhatPlaysWhatFormat table at the least. If the new Player were manufactured by a Manufacturer not in the database, you would need to create an INSERT query for the Manufacturer table as well.

Cache.Insert(key, item, dependencies, absoluteExpiration, slidingExpiration)

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