Status Updates From Professional C# 7 and .net ...

In general, if you are writing an executable, try to catch as many exceptions as you reasonably can and handle them in a sensible way. If you are writing a library, it is normally best to catch exceptions that you can handle in a useful way, or where you can add additional information to the context and throw exception types.

StringBuilder has better performance than String class. It's better to user StringBuilder to do any manipulation of strings, and use String class to store or display the result

Boxing and it's counterpart, unboxing, enable you to convert value types to reference type and then back to value types.