Use of unassigned local variable 'fout'

Hegel

Some body please help me.
I finds this code really correct.
However I am a beginner
The following code yields

Use of unassigned local variable 'fout' error in my pgm please help

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 using System;

using System.IO;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;

namespace ConsoleApplication6

{

    class Program

    {

        static void Main(string[] args)

        {

            FileStream fout;
 
            try

            {
 
                fout = new FileStream(@"C:\abc1.txt", FileMode.Open);

            }

            catch(Exception exc)

            {

                Console.WriteLine("0.Error on access"+exc.Message);

            }
 
            try

            {

               fout.WriteByte((byte)'F'); 

            }
 
            catch(Exception exc)

            {

                Console.WriteLine("1.Error on write "+ exc.Message);
 
            }

            fout.Close();

            Console.ReadLine();
 
        }

    }

}

tlhintoq

Line 13 you never assign anything to fout, so it is still null.
LIne 18 you try to assign something to it, but that has the potential to fail leaving fout at null
Line 27 then tries to use that yet-to-be-assigned fout

IanWright

A better way to do it, as WriteByte is dependent on you opening the FileStream correctly.

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try

            {

                fout = new FileStream(@"C:\abc1.txt", FileMode.Open);

                fout.WriteByte((byte)'F'); 

            }

            catch(Exception exc)

            {

                Console.WriteLine("0.Error "+exc.Message);

            }

            finally

            {

                if(fOut != null) {fOut.Close()};

            {

insertAlias

Right, you don't have to set up a try block for each potential failure, you can use one try with multiple catches (each for a different type of Exception) if you want.

Use of unassigned local variable 'fout'

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re: Use of unassigned local variable 'fout'

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