Windows Service to delete file in C#

Hello Experts,
In a Windows Service program, I am trying to delete a file.  It works fine in my machine.  For example if the file is found, my program  deletes it and if the file not found, I get exception.  Same program when copied to production, neither the file gets deleted, not do I get any exception.  I am sure it goes to delete portion of the method.  Because I tested it with log4net.  FYI, in development I am using Windows 7 Pro and in Production Windows Server 2008 R2.  Any idea?  Below is my code.  Please help.

Thank you in advance.

public void DeletePMTFile()
        {
            string fullName = System.Configuration.ConfigurationManager.AppSettings["FULL_NAME"];
            string filePath = System.Configuration.ConfigurationManager.AppSettings["FILE_PATH"];
            var reader = new StreamReader(fullName);
            reader.Close();

            FileInfo fileName = new FileInfo(fullName);
            if (File.Exists(fullName))
            {
                try
                {
                    Array.ForEach(Directory.GetFiles(filePath), File.Delete);
                }
                catch (System.IO.IOException e)
                {
                    log.Error("DeletePMTFile: Error while deleting the file" + e.Message);
                    return;
                }
            }
            else
            {
                log.Warn("DeletePMTFile: " + filePath.Trim() + " not found");
            }
        }

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