(adsbygoogle = window.adsbygoogle || []).push({}); What I'm meaning is, if I obtain source code for a program, how do I get the program to work/run? I'm very confused with this topic. :/

You have to have a program compiler and editor.

Any suggestions? If the source code is in C#, would I need a C# compiler or would one compiler work for all languages?

yes, you will have to use a compiler in the same language as the code itself. or atleast able to understand the other language... I'm pretty sure that is correct, but not 100% sure

If you have the source code of the program, you can make modifications to it if you please, then to run it you have to determine what the programming language is and then download and install the corresponding compiler, interpreter, or assembler.

Google SharpDevelop. That's a free program editor/compiler made specifically for C#.