Very basic but need help copying files!! Please help!

Question

I have just started learning the language. I want to copy a file from one location to another on the instance of a mouse click in a windows form. I have been trying to use the File.Copy function or just COPY or COPYFiles and none of these work. When I try to build it says File not declared or COPY not declared. What is that all about? In all the books it says you don't need to make a new instance of file since it is already a static class. I am very confused. also need help on how to read in keyboard input from a textbox in a wondows form. I know I am a very basic user and this should be easy but I have no idea what I'm doing. Thanks