How user defined exceptions in c sharp works?

Answer 1

It works the same way as the ones in System.Exception:

To make an exception happen, use the keyword throw, followed by an instance of an Exception (or an object from a derived Exception. A user defined exceptions of course is a derived exception)

Exception anException = new WowException(); //or new Exception("Wow");

throw anException;

The catcher can specifically catch the exception being thrown, or generally as catch-all:

try {

MakeMyDay();

} catch (MyOMyException e) {//do something about e}

catch (Exception e) { //do something about e}

void MakeMyDay() {

//some code, and encounter some special cases

throw new MyOMyException();

}

public class MyOMyException : SystemException //I prefer SystemException. ApplicationException will do as well, but not Exception

{ public MyOMyException() : base("My-Oh-My, what you've done?!"){}}