New Post: GetUsersFromNames Value cannot be null issue

I am not sure what is going wrong with your code. It seems perfectly alright.

Concerning the modification of Tweetinvi you can just update the Tweetinvi.Logic project as you said and rebuild it.
I am using Visual Studio 2013 but the project should work in Visual 2012.

Just by curiosity, what are you trying to change in the DTOs?

Linvi