C# ClassesLesson 36Free preview

C# Exceptions

This lesson is part of C# · All levels

Summary

An exception is a state of error that occurs when a program is running, such as dividing by zero or reading an empty file. C# handles it with try, catch, and finally block so that the program can continue to execute safely. You can also throw your own exception with a throw to report an invalid condition.

Key points

The try block contains risky code, catch catches exception, and finally always runs.
The common exceptions are DivideByZeroException, FormatException, IndexOutOfRangeException, and FileNotFoundException.
The throw new exception statement is used to throw the exception itself with a statement message.
It's best to capture specific types of exceptions, not all exceptions in one empty catch.
The block finally suits to clean up the resource like closing a file or connection.

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