C# Source Code Search Engines For Internal Use

I work on a lot of different projects, both in the company I work for and in my spare time. A lot of code has been produced during that time and I constantly find myself searching for that “I remember I once wrote something like this” code. Google helps, but its search engine is not specialized for C# code and I sometimes have to do a lot of searching before finding a snippet that is perfect for my needs. Snippets in VisualStudio are helpful too, but I use them mostly for really repetitive code which merits taking time to write the snippet.