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.NET XML writers only ensure the well-formedness of each individual XML element being generated. Writers can in no way guarantee the well-formedness of the entire document and can do even less to validate a document against a DTD or a schema. Although badly formed XML documents can only result from actual gross programming errors, the need for an extra step of validation is often felt in production environments, especially when the creation of the document depends on a number of variable factors and run-time conditions. For this reason, we've also examined the key points involved in the design and implementation of a validating XML writer. This chapter also featured a few custom XML-driven writers. In this chapter, you learned how to write string arrays, JPEG images, and DataTable objects to specific XML schemas. It goes without saying that the techniques discussed here do not exhaust the options available in the .NET Framework for those tasks. For example, the XML serializer can sometimes be more effectively employed to obtain the same results. (XML serializers are covered in 11.) These examples were provided with a double goal: to show one way to solve a problem, and to demonstrate custom XML writers. As a general guideline, bear in mind that the more specific an XML-based format is, the more a specialized writer class can help. The key advantage of a writer class is perhaps not so much raw performance savings but the resultant elegance, reusability, and efficiency of the design. We've also looked at an intermediate level of XML parser that falls somewhere between streaming parsers such as readers and XML DOM. XML readers are great for parsing XML documents, but they work in a read-only way. XML DOM parsers, on the other hand, make updating documents a snap but only after the documents have been fully loaded in memory. The XmlTextReadWriter class incorporates a reader and a writer and coordinates their independent activity through a simple new API. As a result, you can parse a document one node at a time while maintaining the ability to add, update, or delete nodes. The new class is not the cure-all for any XML pains, but it can be an interesting option in some situations. In 5, we'll examine the XML DOM classes that you must use when full read/write access to XML documents is critical and when the ability to perform searches takes precedence over the memory footprint.
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To isolate only the shortest paths, add a second CTE (BOMMinDist) that groups all paths by assembly and part, returning the minimum distance for each group. In the outer query, join the rst CTE (BOMPaths) with BOMMinDist, based on assembly, part, and distance match to return the actual paths. Run the following code to produce the shortest paths in BOM:
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Correct Answers: D A. Incorrect: Windows Server 2003 Server does not support NetBEUI, and it cannot be installed on Windows XP Professional. Even if it were installed on the hosts that can support it, NetBEUI would not solve this problem. It cannot resolve NetBIOS names across a router, and a large domain is likely to be subnetted. B. Incorrect: The problem is that some hosts cannot update resource records in DNS and need DHCP to perform this task for them. Allowing all dynamic updates would not solve this problem, plus it would compromise security in the domain. C. Incorrect: This setting is a DHCP setting, and it cannot be configured from the DNS console. D. Correct: DHCP updates resource records for Windows NT 4 clients that cannot register their own details in DNS, for example. Note that this solution might not be complete. Any Windows NT 4 server that has a static IP configuration needs to have its host A resource record entered manually. WINS would be a good solution in this scenario, but the question does not provide this alternative.
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In this code, x is declared in Main s stack frame . The address of x is then passed to GetVal . GetVal s v is a pointer to the Int32 value in Main s stack frame . Inside GetVal,
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Finally, the stored procedure returns for each node the node ID, level, and integer sort value. To test the procedure, run the following code, specifying empname as the sort columns. The code generates the output shown in Table 9-23. EXEC dbo.usp_sortsubs @orderby = N'empname';
For more information about network locations, see Understanding Location Types, 12.
While the IDataReader is open, no operation can be performed using the IDbConnection other than to close it; closing the connection also closes the IDataReader.
Note Note that the information contained in this example is also supported by gradient color fills: this is the case for both the plot area (which ranges from cool blue to moderate yellow to warm red) and the upper temperature line whose colors are considerably more vivid . Because this example concerns Scandinavia, a mean temperature in excess of 20 degrees Celsius is considered to be warm . Example 3
input2, and get rows (including the rn attribute) that appear in input1 but not in input2. If row R
The changed statement, shown in boldface, indicates that the new assembly will be version 2.0.0.0. The StringPrinter.cs file is now as follows:
6 Here s the TransactionType_Transfer transaction type.
Figure 2-14 Mixed designs are also possible but not essential!
NOTE E
When specifying the query, choose the DotNetReferences table and select the asterisk (*) to query for all the columns . Finally, enable paging, sorting, and selection on the GridView Configuration menu . After configuring the GridView, Visual Studio will show you a design-time representation of the format the query will use when it is rendered to the browser:
Using Windows Help And Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322 Online Help vs . Offline Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324 Browsing Through Windows Help And Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325 Searching for Help Topics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326 Using Guided Help and Demos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327 Connecting to Another PC withWindows Remote Assistance . . . . . . . . . . . . . . . . . . . . . . . . 330 How Remote Assistance Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332 Asking for Remote Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334 Offering Remote Assistance to Someone Else . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338 Working in a Remote Assistance Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339 Using Remote Assistance with Earlier Windows Versions . . . . . . . . . . . . . . . . . . . . . . . 342 Maintaining Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342 Improving Remote Assistance Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343
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