Now that Google's discontinued their SOAP API, what can I use to search from C# code?
I know they have a Javascript AJAX API – I've implemented it and it works – but I just need to do the same thing but from the backend code.
The AJAX API has a RESTful interface. Have a look here in the section titled "Flash and other Non-Javascript Environments"
For Flash developers, and those developers that have a need to access the Web Search API from other Non-Javascript environments, the API exposes a simple RESTful interface. In all cases, the method supported is GET and the response format is a JSON encoded result set with embedded status codes.