The final topic in our .NET 5 Breaking Changes series is WPF and Windows Forms. These desktop technologies were unavailable before .NET Core 3.0, as earlier versions of .NET Core focused on web-based applications via ASP.NET Core.
Windows Forms, unofficially known as WinForms, was one of the original application frameworks when .NET was first released in 2002. (The other frameworks were WebForms, console, and Windows Services.) WinForms was heavily influenced by Visual Basic, and like VB it acts as a thin wrapper around native Windows controls. This offers really good performance in the default case, but is fairly limited on customizations. Generally speaking, developers would allow the OS to handle aspects such as styling.
