Today I discovered trial and error driven development for myself:

Me, reading spec..
Spec: „Do something with an CSR“ (not the exact wording :D)

So instead of just googling C# + CSR and copying the code examples,
I went like:
What means CSR -> Certificate (Something Something)
-> could be this namespace (Something with „Crypto...“ in its name)
-> could be this class (Something with „Certificate“ in its name)
-> take the easiest overload (string is always nice)
-> try filling in the parameters from the spec
-> start debugger and inspect properties
-> repeat if necessary

I don’t know if this is the correct pattern to proceed my project with...
But hey, today it worked and now I also know, what „distinguished“ means