Get External Window Controls

I have an App called App-A and another one called App-B

With App-B I will like to get properties and controls from App-A...

I was trying to use this: https://www.codeproject.com/Articles/16481/NET-Object-Spy-and-InvokeRemote But i can not make work the dll in visual studio 2017, it display errors related with LNK2028 and LNK2019

someone could help me to complete this? Maybe getting this work in 64bits?

... or maybe how to use the reflection library to accomplish the same?

Thanks!

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Yordy Corrales