The .NET Framework is a software framework developed by Microsoft that runs primarily on Microsoft Windows. Dot net framework has a large class library called Framework Class Library (FCL). Its Free, Cross-platform and Open source tool. Supported on Windows, Linux, and macOS. Microsoft began developing .NET Framework in the late 1990s, originally under the name of Next Generation Windows Services (NGWS).
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Download .Net Framework 3.5 offline Installer from MEGA
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See all supported versions of Microsoft .net framework. Microsoft dotnet-framework from official website.