While I wouldn't discourage anyone from using forums, you really should be performing a web search for yourself before posting questions on forums. There's loads of examples and explanations out there already and it's quite easy to find them if you care to look.
If you don't know what recursion is then I suggest that you get an understanding of that first:
Once you understand that, it should be fairly obvious what a recursive file search is and you can find information on that and even with VB.NET specifically:
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