Proper Way of Releasing COM Objects in .NET

I've spent the last 30 years building durable code for government, healthcare, and utility companies, from Fortran 4 to C#, on databases from pre-SQL ISAM ones to Oracle 11g, and on platforms from the VMS to Linux (not to exclude all common permutations by Microsoft). In my spare time, I teach classes on whole-system design principles from configuring SANS, programming switches, to advanced principles in C# for creating secure, durable code.