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which version of Windows Server 2008 you re installing. You ll get a couple of extra prompts and warnings, but if you only want to run a demonstration or evaluation environment for 30 days or fewer, just skip entering the PID. You ll have a fully functional Windows Server 2008 installation for those 30 days. If you decide to convert a server installed without a PID to a fully activated Windows Server 2008 server, you need to enter a PID for the exact same version of Windows Server 2008 that you said you were installing when you initially installed. That means if you used retail media to install the server, you must provide a retail key. If you used the SBS 2008 media, you use the key provided with SBS 2008. You can t change which version is installed without completely reinstalling Windows Server 2008. To enter a product key for a server installed without a PID, use the slmgr.vbs -ipk command. barcode generator source code
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data.Add(new GridData() { Name = "Jane Doe", Age = 32, Male = false}); data.Add(new GridData() { Name = "Jason Smith", Age = 54, Male = true }); data.Add(new GridData() { Name = "Kayli Jayne", Age = 25, Male = false }); return data; } } }
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When compiling this code, the compiler emits a tiny catch filter funclet for each catch block contained inside the SomeMethod method. When an exception is thrown, the CLR calls the NullReferenceException funclet and passes it the object that identifies the thrown exception. The catch filter funclet checks whether the type of the object is a NullReferenceException or a type derived from NullReferenceException. If there isn t a match, then the catch filter funclet returns a special value telling the CLR to continue searching. In my example, the InvalidCastException funclet is asked next, followed by the "catch all" filter funclet. If the "catch all" catch block didn t exist, then the CLR would continue walking up the call stack. When a catch filter funclet recognizes the thrown object s type, it returns a special value to inform the CLR. The CLR executes all the finally blocks necessary to unwind and clean up the started operations farther down the call stack. Then the CLR passes execution to the code contained inside the catch block. In C# and many other languages designed for the .NET Framework, a catch filter is simply a data type. The catch filter funclet matches the thrown object s type against the filter s specified type. However, the CLR supports more complex catch filters. Microsoft Visual Basic, C++ with Managed Extensions, and IL assembly language are the only languages that I m aware of that allow more complex catch filters. Here is some contrived Visual Basic code that demonstrates a complex catch 333
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A number of vendors that sell dial-up access servers have implemented the ability to create a tunnel on behalf of a dial-up client. The computer or network device providing the tunnel for the client computer is variously known as a front-end processor (FEP) for PPTP or an L2TP Access Concentrator (LAC) for L2TP. For the purposes of this chapter, the term FEP is used to describe this functionality, regardless of the tunneling protocol. To carry out its function, the FEP must have the appropriate tunneling protocol installed and must be capable of establishing the tunnel when the client computer connects. In the Internet example, the client computer places a dial-up call to a tunnelingenabled NAS at the ISP. For example, a corporation might have contracted with an ISP to deploy a nationwide set of FEPs. These FEPs can establish tunnels across the Internet to a tunnel server connected to the organization s private network, thus consolidating calls from geographically diverse locations into a single Internet con nection at the organization s network. This configuration is known as compulsory tunneling because the client is com pelled to use the tunnel created by the FEP. Once the initial connection is made, all network traffic to and from the client is automatically sent through the tunnel. With compulsory tunneling, the client computer makes a single PPP connection. When a client dials into the NAS, a tunnel is created and all traffic is automatically routed through the tunnel. An FEP can be configured to tunnel all dial-up clients to a spe cific tunnel server. The FEP could also tunnel individual clients, based on the user name or destination. Unlike the separate tunnels created for each voluntary client, multiple dial-up cli ents can share a tunnel between the FEP and the tunnel server. When a second cli ent dials into the access server (FEP) to reach a destination for which a tunnel already exists, there is no need to create a new instance of the tunnel between the FEP and tunnel server. Instead, the data traffic for the new client is carried over the existing tunnel. Because there can be multiple clients in a single tunnel, the tunnel is not terminated until the last user of the tunnel disconnects. Although some facets of compulsory tunneling might seem attractive at first, the overall supportability, administration, and exorbitant cost of the compulsory tunnel model make it less popular than the voluntary tunnel model, which is the prevalent VPN standard today.
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Marshaling Objects by Value Marshaling by value downloads the entire object's contents to the client, which uses the instance data to initialize a client-side object of that type. The client obtains a perfect local clone of the original object and can work with it completely oblivious to the fact that the object data has been downloaded from a remote location. In general, MBV is not recommended when you have to cope with large objects with several properties. With MBV, you take the risk of consuming a significant portion of bandwidth to perform the full object's data download, thus subjecting the client to a potentially long wait to execute only one or two methods. MBV also imposes some constraints on the remotable objects. In particular, any objects that need to be consumed by value must qualify as serializable which is not the case for all objects. In addition to objects that deliberately make themselves nonserializable, some objects are objectively hard to serialize. In this list, you certainly find classes that represent or contain database connections. More generally, the list includes all those objects that can't be reasonably represented outside their native environment. This happens when all or part of the information stored in an object does not make sense once the object is transferred to the client. If the object has any implicit dependencies on server-side resources, you can't just use it from the client. For example, if the class has a method that accesses a SQL Server table, you could call it from the client only if the same SQL Server table is accessible from the current location. 428
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52: 53: } 00401054 00401055 54: 55: void CDeclFunction ( char * 56: 57: 58: { 00401056 00401057 59: 00401059 0040105A 60: } 0040105B 0040105C 61: 62: void __stdcall StdCallFunction ( char * 63: 64: 65: { 0040105D 0040105E 66: 00401060 00401061 67: } 00401062 00401063 68: 69: void __fastcall FastCallFunction ( char * 70: 71: 72: { 00401066 00401067 00401069 0040106C 0040106F 73: push mov sub mov mov ebp ebp,esp esp,8 dword ptr [ebp-8],edx dword ptr [ebp-4],ecx char szString , , ) chChar unsigned long ulLong pop ret ebp 0Ch push mov nop nop ebp ebp,esp char szString , , ) chChar unsigned long ulLong pop ret ebp push mov nop nop ebp ebp,esp char szString , , ) chChar unsigned long ulLong pop ret ebp
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Finally, build the project. You should now have a custom server control based on the TextBox class that also uses an embedded AJAX UI control targeted to work with the Microsoft AJAX Library. In the next exercise, you will practice how to use this control. data matrix generator
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The Web Parts architecture serves multiple purposes . Given that the job of Web Parts is to behave as a bigger UI lever, the functional components have been broken down into overall page management and zone management . WebPart controls need to be coordinated together . In addition, the different functional areas of a page often need to be handled as a group of controls (for managing layout, for example) .
Note Not all supported SQL*Plus commands are properly interpreted for Run Script. For example, the COLUMN command did not change the column headings, but SET FEEDBACK OFF worked as expected.
32. Self-Documenting Code
before you begin
Reviewing the Call to Action and Key Point Slides for The Class
Using a Templated User Control
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