Question

Discuss exception handling. How does exception handling change the flow of code execution?

Also discuss the use of TRY, THROW and CATCH when handling an exception.

Answer 1

Exception Handling is used to handle the Exceptions means to handle Errors

occurred while Running a Application.If any exception occurred then the program execution will stops

Automatically In order to handle that abnormal behaviour we are Handling Exceptions.To Handle

Exceptions we are using Try and catch and Finally and Throw.

Try block is used to Place the Code where there is chance of Error Occurrence.

If any Error Occurred in try block then it automatically goes into catch block.

In Catch Block we are able to log the Exceptions to a Log File or we are able to show a Use

Understandable Error Message to User.We can have any number of Catch Blocks For a single Try

Block But Catch(Exception e) is able to Handle any type of exception.If we want to use Specific type of

exceptions we are able to use based on our requirement like

catch (DivideByZeroException e)

But we have place all this specific Except above the Catch(Exception e) then only first it will check

specific type of exception if its not satisfied then comes to Catch(Exception e)(it will handle all

exceptions).

Throw is used when we want throw exception to the calling function then we are using throw.then

Exception will throw to the calling function there it will execute.

Ex: throw new System.ArgumentException("Test", "TextEx")

Finally block is used if error occurred or not in both the cases we want to do any functionality then we

are placing that code in finally block.

Mainly we are placing Database Connection Closing and DataReader Dispose and Dataset Dispose.