Prettify gives types and methods the same class when tokenizing c# so they are colored the same. This is because methods are pascal case in c# instead of camel case like in java
Here is what you do:
Note: You will have to install the C# bundle for C# syntax (every other common language is included). To do this, install the "Get Bundles" bundle, and use that to install the C# bundle.
EDIT: Reading the comments I realized TextMate is only a solution for Mac users. Sometimes I forget about Windows.