The .NET framework is developing very quickly, with many new features added to the languages with each version. However, it is interesting how quickly these updates can be used.
Brief historical background (incomplete):
.NET 4.5 (Windows Vista SP2 +): Metro, async / await, Unicode console, generics in MEF, IDN, EAI, ZIP;
WPF: Ribbon control, async validation, pixel scrolling, static properties bindings, live shaping, better weak events support.
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.NET 4.0 (Windows XP SP3 +): Parallel Extensions, Parallel LINQ, Task Parallel Library, dynamic dispatch and DLR, covariance and contravariance, defined parameters, indexed properties, code contracts, BigInteger and Complex classes.
.NET 3.5 (Windows XP +): LINQ, Expression Trees, Compact Framework, HashSet, EventSchemaTraceListener, GC latency mode, reflection in partial trust, ReaderWriterLockSlim, DateTimeOffset, TimeZoneInfo;
WCF: Workflow Services, Durable Services, Web Programming Model, Atom and RSS, Web Services Interoperability;
WPF: IME for TextBox, image caching, binding debugging, IDataErrorInfo, WinForms Interoperability.
.NET 3.0 (Windows XP +): Windows Communication Foundation (WCF), Windows Presentation Foundation (WPF), Windows Workflow Foundation (WF), Windows CardSpace.
.NET 2.0 (Windows XP +): 64-bit, generics, generic collections, partial classes, nullable types, anonymous methods, iterators, remoting, ACL, Console, debugger attributes, Edit and Continue, FTP requests, HTTP caching, proxy discovery , HttpListener, GZIP, ping, SerialPort, SMTP, Semaphore and other threading improvements, trace data filtering, transactions;
WinForms: DataGridView, ToolStrip, MaskedTextBox, SoundPlayer, SplitContainer, WebBrowser, layout panels.
.NET 1.1 (Windows 2000+): side-by-side execution, IPv6, security permission changes.
.NET 1.0 (Windows 98+): the miracle happened.
(Errors and inaccuracies are possible. If anything, correct.)
In all questions, you can give several answers, so if you run several projects, you can mark for each (although voting for one option several times will not work). Round up to the nearest. If you are not using the .NET Framework, then please click on the “Refrain” button.