There is nothing that will automatically convert those to WinForms apps. You WILL have to recode the apps at least minimally to accomplish this conversion. Since we can't see the source code, it's impossible to tell you exactly what you have to do or how much work it's going to be. It really depends on the quality of the original coding job.
Thus, you will notice that whether you use Visual Studio or build classes in a text editor and compile via prompt, there will be subtle differences that you need to handle.
So it will be easiest to separate the bulk of the business logic from your console app and put it all in a new windows app that you design new.
I have a very simple/complex question to ask of anyone who as ever worked with/in the dinosaur environment known as ADP. Which ironically probably cuts most of our paychecks =(.
I would LOVE to speak with some one who has experience programming from C# to ADP via (preferably) XML or ADODB (which ADP no longer support).
I've received tons of materials from them and have access to their support staff, however their training materials may as well be written with invisible ink, if it was at least written in Arabic/French/Chinese/German/Greek/... at least I could convert it to English and try to understand how it works.
So in short. PLEASE email/reply if you or anyone you know has even heard of any type of .Net to ADP programming.
The basis of this question comes from an integration request to take data from a .Net environment to a ADP environment.