Vb .net File Transfer With Throttle

I am writing a simple VB application that will allow our users to transfer files and folders from one computer to another. The part I do not know how to do is the actual file transfer. In addition, I need to be able to throttle the bandwidth used by the transfer. So, I need to be able to call the function like:

transferFile(sourceFile, destinationFile, throttleSpeed)

or

transferFolder(sourceFolder, destinationFolder, throttleSpeed, booleanRecurseOption)

I will also need the code…