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In ADO.NET 1.x, the DataTable class supports runtime object serialization through the .NET formatter classes, but not any form of XML serialization. The DataSet object, for example, has ReadXml and WriteXml methods that allow you to save to and restore from an XML stream. Serializing the DataTable to XML is not hard you just create a temporary DataSet, copy the DataTable to it, and serialize the DataSet. The same functionality is now natively exposed from the same DataTable class.

In the following chapters, we ll dive into all the technical details of VPN You ll get more technical VPN knowledge than you can imagine, but let s start with a lay person s view of virtual private networking and what it can do for you Because you are interested in this book and therefore are interested in VPN and remote access solutions it s a safe bet that your company is running a network to access computer resources and services within the walls of your offices Also, you more than likely have Internet access for your users to access resources and ser vices out on the Internet The two concepts sound similar, don t they Your users are accessing services on your network or out on the Internet, and that means the Internet is a network like the one in your office.

The implementation of the Command attached property creates an instance of the ButtonBaseClickCommandBehavior class by using the OnSetCommandCallback callback method, as shown in the following code example.

public sealed class Complex { public static Complex operator+(Complex c1, Complex c2) { ... } public static Complex Add(Complex c1, Complex c2) { return(c1 + c2); } }

Note that it is possible to run NGen .exe in update mode . This tells the tool to run NGen .exe on all of the assemblies that had previously been NGen d . Whenever an end user installs a new service pack of the .NET Framework, the service pack s installation program will run NGen .exe in update mode automatically so that NGen d files are kept in sync with the version of the CLR installed .

TABLE 21-2

More importantly, the Internet is a free network that spans the entire planet, interconnects everything and everyone, and can be considered an extension of your network That means you can use it to communicate with all your users while they are out of the office or to interconnect various office sites These Internet capabilities eliminate the need for modem pools, ISDN servers, and private leased WAN lines There is a problem, though The network within your walls is a private network that only your authorized users can access and work with, while the Internet is available for everyone s use Without proper precautions, the Internet can be a dan gerous place for a company to live your assets, customer data, control systems can all be exposed to unauthorized users if you use the Internet as a communica tions system That is where the power of VPN comes in.

Exam Objectives in this :

void SomeRoutine( const LARGE_OBJECT &nonmodifiableObject, LARGE_OBJECT *modifiableObject );

Now, as you develop your application, turn on the compiler s /checked+ switch for debug builds . Your application will run more slowly because the system will be checking for overflows on any code that you didn t explicitly mark as checked or unchecked . If an exception occurs, you ll easily detect it and be able to fix the bug in your code . For the release build of your application, use the compiler s /checked-switch so that the code runs faster and overflow exceptions won t be generated . To change the Checked setting in Microsoft Visual Studio, display the properties for your project, select the Build tab, click Advanced, and then select the Check For Arithmetic Overflow/underflow" option, as shown in Figure 5-1 . If your application can tolerate the slight performance hit of always doing checked operations, then I recommend that you compile with the /checked command-line option even for a release build because this can prevent your application from continuing to run with corrupted data and possible security holes . For example, you might perform a multiplication to calculate an index into an array; it is much better to get an OverflowException as opposed to accessing an incorrect array element due to the math wrapping around .