Net 4.0 Framework =link= -

Released in April 2010 alongside Visual Studio 2010, the .NET Framework 4.0 was not merely an incremental update; it was a statement of intent. It sought to unify these divergent streams, bolster enterprise-level performance, and introduce programming paradigms that would define the next decade of C# development. Looking back a decade later, 4.0 stands as a pivotal milestone—the bridge between the "WinForms era" and the modern "Cloud era."

static void Main(string[] args)