write to a text file without overwriting existing file content in c#

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Hi,

I need to write to an existing text file without overwriting the existing content.

Suppose the file sample.txt has following content

sample.txt:

visual c#
visual basic
asp.net
webservices

Now i want to write the same file below the content "webservices" as shown below

visual c#
visual basic
asp.net
webservices
dotnet
wcf webservice

when i tried to write using streamwriter class it overrides the existing content and updated the file with new data.Sample code is shown below.
Can anyone please help me reg this.

C#

string path = Path.Combine(outputpath, outputfile);
         fileStream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write);
         writer = new StreamWriter(fileStream, Encoding.UTF8);
         for (i = 0; i < dt.Columns.Count - 1; i++)
         {
             writer.Write(dt.Columns[i].ColumnName + ;);
         }
         writer.Write(dt.Columns[i].ColumnName + ;);
         writer.WriteLine(); /*For Data in the Rows*/

         foreach (DataRow row in dt.Rows)
         {
             object[] array = row.ItemArray;
             for (i = 0; i < array.Length - 1; i++)
             {
                 writer.Write(array[i].ToString() + ;);
             }
             writer.Write(array[i].ToString());
             writer.WriteLine();
         }
         writer.WriteLine("-------------------------------------------");
         writer.Flush();
         writer.Close();

Posted 26-Dec-11 1:42am

cherlaprashanth

Updated 26-Dec-11 1:49am

Anuja Pawar Indore

v2

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Om Prakash Pant · Answer 1 · 2011-12-26T01:46:00

This will be appended to the existing file.

C#

// This text is always added, making the file longer over time
using (StreamWriter sw = File.AppendText(path))
{
    sw.WriteLine("This");
    sw.WriteLine("is Extra");
    sw.WriteLine("Text");
}

Check the following for complete example:

http://msdn.microsoft.com/en-us/library/system.io.file.appendtext.aspx[^]

**Dalek Dave** · Answer 2 · 2011-12-26T01:49:00

Solution 2

Sounds like you need to append text
see here[^]

and here[^]

Posted 26-Dec-11 1:49am

Dalek Dave

NandaKumer · Answer 3 · 2011-12-26T09:33:00

Solution 3

check this blog
Insert Text into Existing Files in C#, Without Temp Files or Memory Buffers[^]
--NDK

Posted 26-Dec-11 9:33am

NandaKumer

RaviRanjanKr · Answer 4 · 2011-12-26T09:59:00

Solution 4

In order to append an existing file, set the Boolean parameter to true, as follows:

C#

System.IO.StreamWriter file =
   new System.IO.StreamWriter("YourFile", true);

Posted 26-Dec-11 9:59am

RaviRanjanKr

Updated 26-Dec-11 10:00am

v2