If you could not find your functions in the list from C# class, it is possible that not exists correct language parsing rule. Click on picture to zoom out it and create similar rule in "Language Parsing Rules" dialog. Add new group for C# language and name it METHOD.
Function Begin: \w*[\s\*]*
Function List Name: \w+\s*[\s\*]*
Function End: \(.*\)
Body Begin: \{
Body End: \}
Body Begin to Body End: \{
by the way you can use the same trick for Java language.
If you are looking for method list of class in C# check
also here.
It will
NOT help to folding and unfolding blocks of code like Eclipse, but you can quickly navigate through code.