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Databases are made up of tables, views, relationships, constraints, and stored procedures. They re usually the domain of the database architects, designers, developers, and administrators. ADO.NET, on the other hand, is how application developers get their hands on these (meaning the tables, views, and so forth not the architects and designers, though sometimes I d like to get my hands on the designers ). With ADO.NET, it s possible to keep these two diverse software developing worlds separate, letting the specialists in both fields focus on what they do best. ADO.NET is a set of classes that encompasses all aspects of accessing data sources within the .NET architecture. It s designed to provide full support for either connected or disconnected data access, while using native binary SQL Server Tabular Data Stream (TDS) format for transmitting data or optionally using Extensible Markup Language (XML) format (which is especially useful through strict firewalls). 14 contains more details about XML, so don t worry about it for now. Just think of ADO.NET as a programmer s window into a data source, in this case the DVC_DB database.

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The classes that make up ADO.NET are located primarily in two assemblies: System.Data.dll and System.Xml.dll. To reference these two assemblies, you need to either add the following two lines to the top of your application source: #using <System.Data.dll> #using <System.Xml.dll> or add a reference to these assemblies in the project s Properties page. The addition of the System.Xml.dll assembly is due to the heavy reliance on XML in the internals of ADO.NET and in particular the class XmlDataDocument. Seven namespaces primarily house all of ADO.NET s functionality. These namespaces are described at a high level in Table 13-1.

Figure 3 14. Adding a new plist property, Icon already includes gloss and bevel effects, and setting it to True will disable the default beveled gloss effect from your iPad app icon.

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Area, Area Uri, Parent Area Uri, Area Path, Forwarding ID, Project Uri Assembly Build Artifact Moniker, Build, Build Type, Drop Location, Build Start Time Build Flavor Build Quality Build Status Changeset ID, Changeset UTCDateTime, Year, YearString, Month, MonthString, Month of Year, Week, WeekString, Week of Year, Date, Day of Year, Day of Month, Day of Week File, Parent Path, File Path, File Extension Iteration, Iteration Uri, Parent Iteration Uri, Iteration Path, Forwarding ID, Project Uri Counter ID, Counter Object, Counter, Counter Instance, Counter Result, Higher Is Better URL Load Test Scenario Transaction Machine Outcome, Outcome Passing Person, SID, Domain, Alias, Email Platform Result ID, Result, Test, Test Type, Test Description, Parent Result, Result Root, Error Message, Load Test Agent List, End Time Run ID, Run, Run Description, Remote Run Run Result, Run Result Message Project Uri, Team Project Category ID, Test Category, Category Full Name, Parent Category Index, UTCDateTime, Year, YearString, Month, MonthString, Month of Year, Week, WeekString, Week of Year, Date, Day of Year, Day of Month, Day of Week Tool Type, Tool Artifact, Display URL Work Item, Previous State

Console::WriteLine("By indexed property"); for (int i = 0; i < hash->Count; i++) { Console::WriteLine("{0} {1}\t\t{2} {3}", skeys[i], hash[skeys[i]], skeys[i], sort[skeys[i]]); } Console::WriteLine("\nBy index"); for (int i = 0; i < sort->Count; i++) { Console::WriteLine("N/A\t\t{0} {1}", i, sort->GetByIndex(i)); } Console::WriteLine("\nBy enumerator"); IDictionaryEnumerator ^enum1 = hash->GetEnumerator(); IDictionaryEnumerator ^enum2 = sort->GetEnumerator(); while ( enum1->MoveNext() && enum2->MoveNext()) { Console::Write("{0} {1}\t\t", enum1->Key, enum1->Value); Console::WriteLine("{0} {1}", enum2->Key, enum2->Value); } Console::WriteLine("\nEnumerate Key"); IEnumerator ^keys1 = hash->Keys->GetEnumerator(); IEnumerator ^keys2 = sort->Keys->GetEnumerator(); while ( keys1->MoveNext() && keys2->MoveNext()) { Console::Write("{0}\t\t", keys1->Current); Console::WriteLine("{0}", keys2->Current); } Console::WriteLine("\nEnumerate Value"); IEnumerator ^vals1 = hash->Values->GetEnumerator(); IEnumerator ^vals2 = sort->Values->GetEnumerator(); while ( vals1->MoveNext() && vals2->MoveNext()) { Console::Write("{0}\t\t", vals1->Current); Console::WriteLine("{0}", vals2->Current); } Console::WriteLine("\nContains a Key 'A' and 'Z'"); Console::WriteLine("{0}\t\t{1}", hash->Contains("A"), sort->Contains("A")); Console::WriteLine("{0}\t\t{1}", hash->ContainsKey("Z"), sort->ContainsKey("Z")); Console::WriteLine("\nContains a Value 'frog' and 'cow'"); Console::WriteLine("{0}\t\t{1}", hash->ContainsValue("frog"), sort->ContainsValue("frog")); Console::WriteLine("{0}\t\t{1}", hash->ContainsValue("cow"), sort->ContainsValue("cow"));

Console::WriteLine("\n\t\t'B' key index: {0}", sort->IndexOfKey("B")); Console::WriteLine("\t\t'frog' value index: {0}", sort->IndexOfValue("frog")); } Figure 7-4 shows the results of the HashSortList.exe program.

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