Writing to An Error File

Posted on 2004-08-26
Last Modified: 2010-04-15
I was wondering what was the easiest way to write to an error file. Ideally, I first want to check to see if the file exists. If it does, I want to open it and add a line (the error message), if it doesn't, I want to create it, then add the line.

Question by:nh_capricorn
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Assisted Solution

sohilm earned 250 total points
ID: 11907287
There is probably different ways to do this, most of the apps I write have a database back end, so I upload the error into the database. The way I handle that is by writing an static error class with a static subroutine that displays the error and also uploads the info to the database.

Another idea would be to display the error and log it to the event log.  ex:
public class ErrorLog
  public static void LogError(Exception e)
    System.Diagnostics.EventLog.WriteEntry(productname,@"The Following Error Occured:" + e.ToString(),System.Diagnostics.EventLogEntryType.Error,901);
    System.Windows.Forms.MessageBox.Show(@"The Following Error Occured:" + e.ToString(),"Error",System.Windows.Forms.MessageBoxButtons.OK,System.Windows.Forms.MessageBoxIcon.Error);

Hope that helps.

LVL 14

Accepted Solution

existenz2 earned 250 total points
ID: 11908988
If you want to use a file for the error log you could use the following code:

using System.IO;

if (File.Exists("<filename>")) {
StreamWriter sw = File.AppendText("<filename>");
else {
StreamWriter sw = File.CreateText("<filename>");


Author Comment

ID: 11921263
Once again I have been presented with two good solutions, both of which I am likely to use, depending upon my needs. Therefore, I increased the points for this question, so that I could make an even split between the two of you (with the resulting points being closer to the original question value).

Thanks Again!

Expert Comment

ID: 11923943
Thank you, that was very kind of you.


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