An exception is a problem that arises during the execution of a program. A C# exception is a response to an exceptional circumstance that arises while a program is running, such as an attempt to divide by zero.
Exceptions provide a way
to transfer control from one part of a program to another. C#
exception handling is built upon four keywords: try, catch, finally,
and throw.
Try: A try block
identifies a block of code for which particular exceptions will be
activated. It's followed by one or more catch blocks.
Catch: A program
catches an exception with an exception handler at the place in a
program where you want to handle the problem. The catch keyword
indicates the catching of an exception.
Finally: It's
optional. The finally block is used to execute a given set of
statements, whether an exception is thrown or not thrown. For
example, if you open a file, it must be closed whether an exception
is raised or not.
Throw: A program
throws an exception when a problem shows up. This is done using a
throw keyword.
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