One of the more common parts of web-based client/server app architecture is converting groups of strings into URL-encoded values that can be included in a URL or form data. It's a tedious process, and I've found the easiest approach to take is put all of my URL or form variables into a dictionary and then call a function on that dictionary to convert it to a URL query string. I've encapsulated this logic into an extension for the Dictionary type.
It requires my String URL-Encoding Extension that I've previously posted.