insert line in text file

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I am developing a windows application. I want to insert header line in text file. In this below code I have created a folder in that folder I have created a text file. Now I want to write first line in that I am getting problem. Is there any mistake in my code.

C#

if ( !( System.IO.Directory.Exists( "C:\\TSOSM" ) ) )
{
   System.IO.Directory.CreateDirectory( "C:\\TSOSM" );
}
else if ( ( newmarketname.Text == "" ) )
{
   MessageBox.Show( "Please write Market Name to Proceed." );
}
else
{
   try
   {
      if ( !System.IO.Directory.Exists( ( "C:\\TSOSM\\" + ( newmarketname.Text + "" ) ) ) )
      {
         System.IO.Directory.CreateDirectory( ( "C:\\TSOSM\\" + ( newmarketname.Text + "" ) ) );
      }
      string FILE_NAME = @"C:\TSOSM\" + ( newmarketname.Text + ( "\\" + ( newmarketname.Text + ".txt" ) ) );
      System.IO.File.Create( FILE_NAME );
      int i;

      string[ ] aryText = "<1>,<2>,<3>,<4>,<5>,<6>";
      System.IO.StreamWriter objWriter = new System.IO.StreamWriter( FILE_NAME, false );
      for ( i = 0; ( i <= 0 ); i++ )
      {
         objWriter.WriteLine( aryText[ i ] );
      }
      objWriter.Close( );
      MessageBox.Show( "created successfully" );
   }
   catch ( Exception ex )
   {
      MessageBox.Show( ex.Message );
   }
}

[edit]indexation adjusted and 3 "\\ " bolded to avoid escaped quotes interpretation and incorrect code format[/edit]

Posted 5-Jan-14 0:13am

hussain548

Updated 5-Jan-14 0:47am

Nelek

v4

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Comments

CPallini 5-Jan-14 6:15am

What is the problem?

hussain548 5-Jan-14 6:18am

line is not inserting

Karthik_Mahalingam 5-Jan-14 6:18am

provide more information.

hussain548 5-Jan-14 6:22am

text file is created but line is not inserted. may be problem in array declaration. I know the way is right but what's the error.

Karthik_Mahalingam 5-Jan-14 6:28am

chk my solution.

1 solution

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Karthik_Mahalingam · Answer 1 · 2014-01-05T00:25:00

Solution 1

array should be declared like this..

in the for loop you have hardcoded 0 value, it should be array length..

C#

string[ ] aryText = "<1>,<2>,<3>,<4>,<5>,<6>";       
 string[] aryText= { "<1>","<2>","<3>","<4>","<5>","<6>"};

    System.IO.StreamWriter objWriter = new System.IO.StreamWriter(FILE_NAME, false);
    for (i = 0; (i <= 0); i++)
for (i = 0; (i <= aryText.Length); i++)
{
objWriter.WriteLine(aryText[i]);

Posted 5-Jan-14 0:25am

Karthik_Mahalingam

Comments

hussain548 5-Jan-14 6:34am

Thanks for reply Karthik sir, I appreciate that. but I am getting this error after changing array diclaration
the process cannot be access the file'c:\TSO0SM\abc\abc.txt' because it is using by another process.
process not entering in to for loop.

Karthik_Mahalingam 5-Jan-14 6:39am

because the text file is opened somewhere outside the application.
close all the text file. and try running it...

hussain548 5-Jan-14 6:45am

No sir, any text file is not opened. at line of stream writer any error is there, because after that it was not moving to for loop.

Nelek 5-Jan-14 6:49am

Are you sure you are closing the file everytime you do something with it? It is not a must you have it open in the notepad, it can be open inside your own application

hussain548 5-Jan-14 6:54am

yes sir, now I restarted my pc and run only mu app then also same error

Nelek 5-Jan-14 7:03am

That is my point, you are opening a handler to that file and not closing it correctly somewhere in you code, so that the next time you try to use it, you get the error. I would restart your pc another time, put a stop point in your code, run the debugger and go step by step to know where is the last place it is used before the error, then try to correct it there. Worst case scenario... the error is triggered very much sooner you get the message.

Another possibility would be to enable sharing access, but then you can have the situation that you modifiy and save something from two different places, what could cause some data to get lost

hussain548 5-Jan-14 7:35am

no sharing access are there sir,

{
if (!System.IO.Directory.Exists(("C:\\TSOSM\\" + (newmarketname.Text + ""))))
{
System.IO.Directory.CreateDirectory(("C:\\TSOSM\\" + (newmarketname.Text + "")));
}
{
string FILE_NAME = @"C:\\TSOSM\\" + (newmarketname.Text + ("\\" + (newmarketname.Text + ".txt")));
System.IO.File.Create(FILE_NAME);
int i;
string[] aryText = { "<ticker>", "<date>", "<open>", "<high>", "<low>", "<close>", "<vol>" };
System.IO.StreamWriter objWriter = new System.IO.StreamWriter(FILE_NAME,true);
for (i = 0; (i <= aryText.Length); i++)
{
objWriter.WriteLine(aryText[i]);
}
objWriter.Close();
}
}
I am not getting why is that error, sir there is any problem with the code.

Kornfeld Eliyahu Peter 5-Jan-14 7:04am

"The FileStream object created by this method has a default FileShare value of None; no other process or code can access the created file until the original file handle is closed." - http://msdn.microsoft.com/en-us/library/d62kzs03(v=vs.110).aspx
It means you need to use StreamWriter with the proper override...

hussain548 5-Jan-14 7:53am

Sir I used stream writer only.
{
string FILE_NAME = @"C:\\TSOSM\\" + (newmarketname.Text + ("\\" + (newmarketname.Text + ".txt")));
System.IO.File.Create(FILE_NAME);
int i;
string[] aryText = { "", "", "", "", "", "", "" };
System.IO.StreamWriter objWriter = new System.IO.StreamWriter(FILE_NAME,true);
for (i = 0; (i <= aryText.Length); i++)
{
objWriter.WriteLine(aryText[i]);
}
objWriter.Close();
}

Now you said that proper override. How can I use that override here.

Kornfeld Eliyahu Peter 5-Jan-14 7:55am

System.IO.File.Create(FILE_NAME);
This line is creates AND opens the file with FileShare==None!!!
So this
System.IO.StreamWriter(FILE_NAME,true);
Can't access it...

hussain548 5-Jan-14 8:08am

yes sir I got your point so what's the solution for this

Kornfeld Eliyahu Peter 5-Jan-14 8:17am

Do something lie this...
FileStream oFS = System.IO.File.Create(FILE_NAME);
Than later...
System.IO.StreamWriter objWriter = new System.IO.StreamWriter(oFS);

HOWEVER!!! If I understood you you want to append! to some existing file. If it's true no room for File.Create, but you have to use open instead...

hussain548 5-Jan-14 14:15pm

thanks a lot sir it works

Kornfeld Eliyahu Peter 5-Jan-14 14:51pm

You welcome...

hussain548 5-Jan-14 18:11pm

Sir I have one more question
I want to add child node to parent node of treeview from another form.
I tried this code, this is executing but not adding a child node.
I have tree view in form 1. I want to add it from form 2 textbox value in button ckick event. I did like this
form1 frm=new form1();
frm.treeview1.Nodes["Market"].Nodes.Add(textbox1.value);
can u let me know the problem

Karthik_Mahalingam 5-Jan-14 23:58pm

HI hussain,
it is out of the topic,
you can post this in a new question. so that you will get answers from others too....
If Kornfeld reply's solved your issue , u can close this question..