From personal experience, I can tell you if you learn C#, or C++, or Java (which is, of course, my personal favorite), you can learn any other language in a matter of days.
Luckily for you, Ruby programming language is sort of like scripting for dummies. No semi-colons at the end of statements, no variable types (meaning a variable can be anything from a String, to a float, to an integer) and, most importantly, a ridiculous and almost impractical approach to objects.
Start by doing the following, learn what is an Object Oriented Programming Language. This is the type of language Ruby is. If you want to get further involved, let me know.