Monday, 19 August 2013

Best .NET Program/Course Training & Placement Institute in Chennai

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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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