How to Compile Software in Visual?

As you all must know by now that I am a plain simple dentist, a little familiar with computers but not to the extent to be able to compile a source code - ;) I hear it ain't too much of a big deal.

The software that I am after is open source and the source code is freely available for anyone to compile and use but if one does not know how to compile it the company can then do it for you and charge a horrendous $200 a month for a year for this simple service - What a rip off. So understandably I'm not too keen on paying for this software (btw who is in Pakistan?)

The software needs to be compiled in Visual C# or Visual Basic (I once ran to the computer store to grab a CD of Visual but only came up with Enterprise version and that simply did not load properly, must have been a busted CD or corrupt version or something). The software is a dental practice managment software and in my opinion a very versatile software as the dveloper has worked to hard to put in all the softwares into one neat package a sort of All-in-One deal and probably better then most dental softwares in the market. In my practice I presently have 3 different softwares and it is indeed a nightmare running them all together I feel that Open-Dent may fix the problem for me once in for all but before I switch I need to mess around with the full version before I migrate into this open source deal.

The instructions are on this page Link
The download page for the source code is Link

Have a look at it and maybe someone might be able to guide me in the right direction, my goal is to learn how to compile it as the company releases updates every month or so and I don't wanna be running around trying to find help. Any help would be appreciated.