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Modern day WinForms in .Net work just as well for coding up simple GUIs.

Winforms is fine, not as powerful as what came before it but otherwise good. The problem with winforms is WPF supposedly deprecating it.

WPF has a much steeper learning curve though. For non customer facing desktop programs, WinForms is fine.

I don't think WPF has been successful in replacing winforms, more that it was a hard sell to management to use winforms after WPF was announced.