The exception keyword is used to create a custom exception in F#; these exceptions adhere to Microsoft best practices, such as constructors supplied, serialization support, and so on. The keyword raise is used to throw an exception. Apart from this, F# has some helper functions, such as failwith, which throws a failure exception at F# runtime, and invalidop, invalidarg, which throw the .NET Framework standard type invalid operation and invalid argument exception, respectively.
try/with is used to catch an exception; if an exception occurred on an expression or while evaluating a value, then the try/with expression could be used on the right side of the value evaluation and to assign the value back to some other value. ...
