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A catch block, in C#, is an optional block of code that is executed when an exception is raised.
Catch block is a specific part of the exceptional handling construct, and is implemented using the "catch" keyword in combination with keywords "try" and "finally" and forms the means to implement structured exception handling. A try block includes the guarded code that can cause the exception. It encloses statements that deal with exceptional circumstances and works to recover from such unexpected conditions.
Catch block forms the means for handling exceptions. If these are not handled, this can lead to termination of the entire program by the .NET run time. A catch block can be used for handling any or specific exceptions.
The exception handling model of Common Language Runtime (CLR) allows more than one catch block, each of which is designed to handle a specific exception. Whenever an exception occurs, the CLR looks for the catch block that handles the exception. If the currently executing method does not contain such a block, CLR searches for it in the method that called the current method up the call stack. If there is no matching clause found for that exception in the entire code, the execution of thread is stopped, and an unhandled exception message is displayed to the user.
The following are a few tips related to the use of a catch block: