Have you tried ML.NET?
It's a new machine learning framework made specifically for .NET developers.

Download .NET Framework

.NET Framework is a Windows-only version of .NET for building any type of app that runs on Windows.

Not sure what to download? See recommended downloads for the latest version of .NET.

Versions of .NET Framework available for download
Version Released End of life
.NET Framework 4.8 (recommended) 2019-04-18
.NET Framework 4.7.2 2018-04-30
.NET Framework 4.7.1 2017-10-17
.NET Framework 4.7 2017-04-05
.NET Framework 4.6.2 2016-08-02
.NET Framework 4.6.1 2015-11-30
.NET Framework 4.6 2015-07-20
.NET Framework 4.5.2 2014-05-05
.NET Framework 4.5.1 2013-10-17 2016-01-12
.NET Framework 4.5 2012-08-15 2016-01-12
.NET Framework 4.0 2010-04-12 2016-01-12
.NET Framework 3.5 SP1 2008-11-18 2028-10-10