Throwing and Catching Exceptions in Functions

We should catch and handle an exception if we have enough information to mitigate the issue. If we do not, then we should allow the exception to pass up through the call stack to a higher level.

Understanding usage errors and execution errors

Usage errors are when a programmer misuses a function, typically by passing invalid values as parameters. A programmer could avoid them by changing their code to pass valid values. When some programmers first learn C# and .NET, they sometimes think exceptions can always be avoided because they assume all errors are usage errors. Usage errors should all be fixed before production runtime.