C# code to zip and encrypt a specified folder on the network

I need some C# code written that will have one method. This method will have one input parameter - the name of a shared folder across a network (eg. \\Server1\Folder2). This method will zip this folder and leave it in the same location. It will also encrypt this zip file with a simple encryption key that can be stored as a constant in this code. This is a relatively simple task so I hope to receive the final work in a couple of days. Thanks.