c# wpf cs0234

Question

i work a project with c# wpf but i can't add "System.Windows.Forms" when i write this code=
using System.Windows.Forms;
i give an error =
cs0234 The name of the "forms" type or namespace does not exist in the "System.Windows" namespace (is your assembly reference missing?)

Answer 1

You must add first a Reference to System.Windows.Forms.dll

For example, for .NET Framework 4.7.2 :
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.7.2\System.Windows.Forms.dll