How to edit registry

How to edit registry

I am attempting to use C# code to edit the registry, but I am not sure how
this would work. I can go and edit it manually, but I would prefer the
code does it automatically for you. Is there a way to use the Registry
class in order to do this? I am unclear how to use it. I am also having
trouble passing values to my program once it opens. How would I use
something like %1 as my arguement? Thanks.