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When you need the data again, you can examine the weak reference s Target and/or IsAlive properties. The Target property will either contain a valid reference or Nil/null; the IsAlive property is true whenever Target is non-Nil. If the Target is Nil, that means the weakly referenced object has been garbage collected and you need to re-create it. If the Target is not Nil, you now have a normal (strong) reference that you can cast to the appropriate type, and that will keep the data from being garbage collected just like any other normal reference does. For example, the 3\WeakReferenceDemo Delphi project creates and sets a weak reference as var Weak: WeakReference; begin Weak := WeakReference.Create(Nil); WriteLn('Weak.IsAlive = ', Weak.IsAlive, ' before assignment'); Weak.Target := System.String.Create('*', 32); // a small string end. The weak reference constructor s first parameter is the initial Target object. (As you can see, you can change a weak reference s Target after creation.) The weak reference constructor s optional parameter is a boolean that allows you to specify either the default short weak reference or the optional long weak reference. A short weak reference is only tracked until the Target is found to be dead; a long weak reference is tracked until the Target is actually finalized. Code like if Weak.IsAlive then WriteLn(&String(Weak.Target)); can examine the IsAlive property, and cast the Target to a String. However, after the demo project exerts a little memory pressure by allocating a few thousand strings, the weak reference no longer points to live data: IsAlive is false, and Target is Nil.

Figure 2-33. Updated item entry form You can make changes to other columns in the same way. Note, however, that if you make changes to value limits such as maximum lengths, these restraints only apply to new data added to the list or when you edit and save an existing item. It does not automatically apply to all previous items.

Garbage collection speeds development and can speed applications Garbage collection makes your life as a developer much easier. Most applications are faster with garbage collection than with manual heap management. Finalization prevents resource leaks, but is expensive. You should use the Dispose pattern whenever possible. There are situations, mostly involving large quantities of large, short-lived objects, that can cause garbage collection performance issues.

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After the service is registered with the Research Library, new queries will be made by calls to the Query method. The response you formulate will be based on a search of the Pubs database using the <QueryText> element passed in by the Research Library. The stream is contained in an XML envelope that you will create as a template. Although the envelope is fairly simple, you must ensure that the domain attribute of the <Response> element is identical to the <Id> element for the <Service> defined in the registration response template. Add a new XML file to your project named QueryResponse.xml and modify it to appear as shown in Listing 8-23. Listing 8-23. The Query Response Envelope < xml version="1.0" encoding="utf-8" > <ResponsePacket revision="1" xmlns="urn:Microsoft.Search.Response"> <Response domain="{3C927E62-566D-4193-AF40-B0CA3E4F3E00}"> <Range> </Range> <Status>SUCCESS</Status> </Response> </ResponsePacket>

Caution SharePoint allows you to change the columns of a list at any time. However, with a survey list, changing the survey questions or possible answers after several respondents have taken the survey invalidates the initial results. That reasoning should govern changes you allow to the columns of any list.

.NET is not interpreted. Your code is delivered as CIL (Common Intermediate Language), not native machine code. Yet, your code is always compiled to native code before being run. This compilation can happen at install time, but is usually done on a Just In Time basis. Managed code is good for both users and developers, and delivering your code as CIL is key to delivering the benefits of managed code to users: intermediate code can be verified before it s run, and running all code through a single compiler means all code does the same run-time checks. CIL is a high-level, strongly typed, stack-oriented assembler language that s easier to read (and write) than any real, native assembler.

A lookup column is a variation of a choice column with the primary difference being where you define the possible values for the column. While you must enter the possible values into the definition of a choice column, a basic lookup column gets its values from another list. You must create this list before

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