File Stream C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Collections.Specialized;
using System.Diagnostics;
public static class FileUtils
{
    public static void AppendToFile(string fileName, string line)
    {
        try
        {
            using (StreamWriter sw = File.AppendText(fileName))
            {
                sw.WriteLine(line);
            }
        }
        catch (Exception ex)
        {
            Trace.TraceError("File I/O Error: {0}, StackTrace: {1}", ex.Message, ex.StackTrace);
        }
    }
}