Copying Form Data to New Form

[BillT]

I have a form which has attributes about systems, and allows users to look up
information about an existing system and edit that information. I want to
have a button on this form which will allow users to, while editing
information for one system, look up another system, open a new form for this
new system and copy over the information for the old system into the new
form. I'm assuming this is going to require some code behind the scenes
(we're a C# shop), but I'm not sure where to start.

Thanks,
Bill