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Every time the item is requested, the Cache object checks to see if there is an available cached version of the item if there is a cached version, it is used, and if there is no cached version available, ASPNET re-creates the item and stores it in the Cache object for future use There is one Cache object per ASPNET web application, and only web pages in that application can access the Cache object There is no sharing between applications through the Cache object Once created, the Cache object s lifetime is the same as the ASPNET web application EXAM TIP There is only one Cache object per web application

The Cache object can be used to store information similar to that which would be stored in an application variable, but that would not normally be considered session state information and stored in the Session object (For a discussion about application and session state, see 13) EXAM TIP The Cache object has application scope and cannot be used to store session variables As you saw earlier in this section, the simple syntax for storing a value in the Cache object is to implicitly assign the value:

One of the key points in determining how to protect information is: A The day of the week B The name of the document C The form of the information itself D None of the above

Cache["theKey"] = theValue;

Alternatively, the item can be inserted into the Cache object by using the Insert() method of the Cache object:

public void Insert(string key, object value, CacheDependency depend, DateTime absolute, TimeSpan sliding, CacheItemPriority priority, CacheItemRemovedCallback callBack);

Table 115 Three acid-base paradigms Paradigm De nition Acid Example of species embraced HCl HCl HCl, Fe3 , BF3 De nition Base Example of species embraced NaOH NaOH, NH3 NaOH, NH3

Paper documents are often considered easier to secure, as they: A Are not dependent on power B Are less valuable C Do not deteriorate with age D All of the above

The Insert() method has a number of signatures the preceding one gives us the most control over how the item is cached The parameters are listed in Table 17-1 The following code segment shows the use of the Insert() method:

CacheInsert("theKey", theValue, null, DateTimeNowAddMinutes(2), TimeSpanZero, CacheItemPriorityHigh, onRemove);

In this example, the key is theKey and the value is theValue The cached item has no dependency (null) and it will be removed in 2 minutes (DateTimeNow AddMinutes(2)) with no sliding aging window (TimeSpanZero) It has a high priority (CacheItemPriorityHigh) and will call onRemove() when it is actually removed from the cache EXAM TIP The number and size of the items that are placed in the Cache object must be planned Storing too many items in the Cache object will actually slow down the server by using too much of the memory for the cache and not leaving enough for the server

Which types of communications components should be inspected A Phone lines B Fax lines C Data lines D All types should be inspected

There are times when you ll need to minimize the response time from the web application to the user By caching pages, or even parts of pages, in memory at the first request, and then using the cached page for all subsequent requests, you will avoid the processing and I/O time that is required to create the page Output caching is a method that is provided through ASPNET to give us that caching environment The difference between

The key for the item that is stored in the Cache object The item that is stored in the Cache object Dependencies for the cached item The absolute date and time when the item will be removed from the Cache object A time interval representing the time after the object was last accessed when the cached object expires If this value is 30 minutes, the object will expire and be removed from the cache 30 minutes after it is last accessed The priority of the cached item The priority is used to determine the order of removal when the web server is running low on memory The callback delegate to receive the event notification when the item is removed from the Cache object

Table 17-1

The Bomb Threat Checklist should not be distributed, until a threatening call is identified A True B False

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