Proper Way of Releasing COM Objects in .NET

I've spent the last 30+ years building secure, durable code in government, healthcare, and critical infrastructure industries, from FORTRAN 4 to C#, on databases from pre-SQL ISAM ones to Oracle 12, and on platforms from 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. I am CISSP and CCSP certified, regularly working with legal teams to validate Cloud security and regulatory compliance.