I am working thru the Microsoft cryptographic walkthrough Walkthrough: Create a Cryptographic Application

I get the “Compiler Error Message: CS1513: } expected” and “Error CS1002: ; Expected” and “CS1026: ) expected” errors for the code if (_rsa is null).

Looking at the C# language reference for the “is” operator is operator (C# reference) it shows this as a valid usage.

Changing the line to if (_rsa == null) works, but I’m curious what the issue is?