The Fundamentals of Structured Exception Handling
An exception is a type of object that is used to report error conditions. A method can throw an exception to send a signal to the hosting application that something has gone wrong during program execution. The CLR itself will also throw an exception when it fails to perform a requested operation. When a method is executing and an exception occurs, the method is given a chance to catch the exception and branch off into contingency code that has been written to handle various kinds of error conditions.
Throwing and Catching Exceptions
Throwing an exception is the one and only official way to report an error condition in the .NET Framework. If you call a method and it does not throw an exception, ...