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The things that ''have'' changed significantly are the semantics—from those of an object-based programming language running on a [[deterministic]], [[reference counting|reference-counted]] engine based on [[Component Object Model|COM]] to a fully [[object-oriented]] language backed by the [[.NET Framework]], which consists of a combination of the [[Common Language Runtime]] (a [[virtual machine]] using [[Garbage collection (computer science)#Generational GC (aka Ephemeral GC)|generational garbage collection]] and a [[just-in-time compilation]] engine) and a far larger [[class library]]. The increased breadth of the latter is also a problem that VB developers have to deal with when coming to the language, although this is somewhat addressed by the ''My'' feature in Visual Studio 2005.
The changes have altered many underlying assumptions about the "right" thing to do with respect to performance and maintainability. Some functions and libraries no longer exist; others are available, but not as efficient as the "native" .NET alternatives. Even if they compile, most converted Visual Basic 6 applications will require some level of [[refactoring]] to take full advantage of the new language. Documentation is available to cover changes in the syntax, debugging applications, deployment, and terminology.<ref>{{cite web|url = http://msdn.microsoft.com/en-us/vstudio/ms788233|title = Microsoft Visual Basic 6.0 Migration Resource Center|access-date = November 9, 2014|website = [[MSDN]]|publisher = [[Microsoft]]|archive-date = November 9, 2014|archive-url = https://web.archive.org/web/20141109140433/http://msdn.microsoft.com/en-us/vstudio/ms788233|url-status = live}}</ref>
==== Comparative examples ====
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{{Main|Comparison of C Sharp and Visual Basic .NET}}
C# and Visual Basic are Microsoft's first languages made to program on the .NET Framework (later adding [[F Sharp (programming language)|F#]] and more; others have also added languages). Though C# and Visual Basic are syntactically different, that is where the differences mostly end. Microsoft developed both of these languages to be part of the same .NET Framework development platform. They are both developed, managed, and supported by the same language development team at Microsoft.<ref>{{cite web |last=Krill |first=Paul |url=http://www.infoworld.com/article/09/02/27/Microsoft_converging_programming_languages_1.html?R=printThis&A=/article/09/02/27/Microsoft_converging_programming_languages_1.html |archive-url=https://archive.today/20130126074556/http://www.infoworld.com/article/09/02/27/Microsoft_converging_programming_languages_1.html?R=printThis&A=/article/09/02/27/Microsoft_converging_programming_languages_1.html |url-status=dead |archive-date=January 26, 2013 |title=Microsoft converging programming languages | Developer World |publisher=InfoWorld |date=February 27, 2009 |access-date=August 18, 2013 }}</ref> They compile to the same intermediate language (IL), which runs against the same .NET Framework runtime libraries.<ref>{{cite web |url=http://www.dotnet-guide.com/msintermediate.html |title=Microsoft Intermediate Language |publisher=Dotnet-guide.com |access-date=August 18, 2013 |archive-date=June 2, 2013 |archive-url=https://web.archive.org/web/20130602151947/http://www.dotnet-guide.com/msintermediate.html |url-status=live }}</ref> Although there are some differences in the programming constructs, their differences are primarily syntactic and, assuming one avoids the Visual Basic "Compatibility" libraries provided by Microsoft to aid conversion from Visual Basic 6, almost every feature in VB has an equivalent feature in C# and vice versa.
== Examples ==
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