ByVal versus ByRef
 

What's the difference between these two (ByVal and ByRef), and where, when, and how do you use them? Thanks :)

Why do you ask? Have you pursued this in your language reference and failed to understand? Here's a cursory difference. If I give you a copy of something, you can edit it, scribble on it, feed it to your dog, or whatever else flips your skirt up, without affecting the original. If I give you access to the original, by telling you how to get at it, you can eff it up at your discretion. Whether or not that's a Good Thang depends on circumstances. That's why you need to think about it when you decide.

Yes, I failed to understand it in the words of Evangelos Petroutsos in his book, and sorry to say, his book (Mastering Microsoft Visual Basic 2005) is not a language reference, and I have no budget for buying another book about Visual Basic 2005. I thought that someone here in PF, professional programmer or not, would have the solution to my question; nevertheless, I thank you, DaWei, for pointing me to the right suggestion.