WPF and UWP support UI Automation, there are even VS project templates for. Forms does not, beyond the typical Win32 SendMessage().

However there are good UI tooling that does a good job in spite of it, assuming that one is willing to pay for them.

https://www.ibm.com/us-en/marketplace/rational-functional-te...

https://www.ranorex.com/

https://eggplant.io/

https://www.tricentis.com/

https://www.microfocus.com/en-us/products/unified-functional...