Which pattern is best to use with wpf c#

Use MVVM architectural pattern, Refer below article. While Learning MVVM will need to learn required patterns like Dependency Injection, Command, Singleton, Observer, Factory pattern etc.

 

https://www.c-sharpcorner.com/UploadFile/raj1979/simple-mvvm-pattern-in-wpf/#:~:text=pattern%20in%20WPF.-,This%20article%20describes%20the%20basic%20use%20and%20functionality%20of%20the,the%20Presentation%20Model%20design%20pattern.