What is the main use of a finally block in exception handling ?

Posted by Bharathi Cherukuri on 7/25/2012 | Category: ASP.NET Interview questions | Views: 2676 | Points: 40

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Answer:

Finally block is always followed by the Try block.
This is because, it is used to free the resources that are used in the try block.

Example:


using System;

using System.IO;



class FinallyDemo

{

    static void Main(string[] args)

    {

        FileStream outStream = null;

        FileStream inStream = null;



        try

        {

            outStream = File.OpenWrite("DestinationFile.txt");

            inStream = File.OpenRead("BogusInputFile.txt");

        }

        catch(Exception ex)

        {

            Console.WriteLine(ex.ToString());

        }

        finally

        {

            if (outStream != null)

            {

                outStream.Close();

                Console.WriteLine("outStream closed.");

            }

            if (inStream != null)

            {

                inStream.Close();

                Console.WriteLine("inStream closed.");

            }

        }

    }

}

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Comments or Responses

Posted by: Bhupentiwari on: 7/27/2012 | Points: 10

try

{

code which can produce error

}

catch()

{

handle that error generated by try block

}

finally

{

a code which is going to executes in spite of whether error is generated in try block  or not

}

you can use finally block to close the connection to databases,files n etc.

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