Catching an exception

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Code can and should throw exceptions in exceptional circumstances. Examples of this include:

The caller can handle these exceptions by “catching” them, and should only do so when:

It should be noted that choosing not to catch an exception is perfectly valid if the intention is for it to be handled at a higher level.

Catching an exception is done by wrapping the potentially-throwing code in a try { ... } block as follows, and catching the exceptions it’s able to handle in a catch (ExceptionType) { ... } block:

Console.Write("Please enter a filename: ");
string filename = Console.ReadLine();

Stream fileStream;

    fileStream = File.Open(filename);
catch (FileNotFoundException)
    Console.WriteLine("File '{0}' could not be found.", filename);

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