We recommend using the Eto.forms library for GUI development. We use it also for the plug-in code we create ourselves (like Rhino Render settings panels).
I know that Eto forms library is recommanded. but My ProjectManager wish me use C# Windowns.forms.
And when i use Eto.Forms View, Eto.Forms 's Toolbox is null.
1.) Open your project’s .vcproj file in a text editor
2.) Change Microsoft.NET.Sdk to Microsoft.NET.Sdk.WindowsDesktop at the top
3.) Add <UseWindowsForms>True</UseWindowsForms> and/or <UseWpf>True</UseWpf> to the <PropertyGroup>