UI: Mapping source field to destination field (TreeView)

I'm creating a windows form application (written in C#) wherein I need to have some sort of mapping functionality (source to destination field). I'd like to have a intuitive user interface where the user could just drag a source field (maybe displayed in a treeview) and match it to the destination field (with lines showing the linkage).

I have no experience in building custom UI in C# and it would be very helpful if you could provide me some example how to achieve this.

Thanks in advance.