Samsung has ported .NET Core and Xamarin studio to support that platform.
Tizen .NET Developer Preview | Tizen
"Samsung joins the Microsoft .NET community enabling C# developers to build applications for Samsung Tizen devices Samsung collaborates with Microsoft on open source projects to enable .NET support for Tizen, which currently powers 50 million Samsung devices around the world"
Preview | Tizen Developers
Introduction to Tizen SDK | Tizen
Tizen Developers | An open source, standards-based software platform for multiple device categories.
Tizen v Android Wear: Which smartwatch OS is right for you?