unable to call executable from webservice

This has me and my team really stumped, and so we could use some help. We want to call an external program from a webservice, but it doesn't seem to find the apps, saying file not found. I've followed the examples in VSNET.2003. The program is C#.net. Here's the snippet:

                        System.Diagnostics.Process proc;
                        Process p = new Process();
                        p.StartInfo.WorkingDirectory =
                        "C:\\Program Files\\Microsoft Visual FoxPro 8";
                        p.StartInfo.FileName = "vfp8.exe";
                        p.StartInfo.Arguments = "c:\\dbflock\\rlock.prg";
                        p.StartInfo.UseShellExecute = false;
                        p.StartInfo.RedirectStandardOutput = true;
                        p.Start();
                        p.WaitForExit();


I calls a foxpro executable in the c:\dbflock subdiretory.  I've tried moving the exe to different places (haven't tried system32), added that directory to the path statement, tried this idea:
System.Diagnostics.Process proc;
                        proc = System.Diagnostics.Process.Start(@"c:\DBFLOCK\RLOCK.EXE", arg1);
                        proc.WaitForExit();


Can you think of another way to start an external executable from a web service? Thanks for any help!
andremaraAsked:
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Niraj_SinghCommented:
hi,
 the file is opened by the aspnet user. this aspnet user does not have sufficient rights to open all file. you may have to give it the required rights.
also refer to the below mentioned link
http://www.code-magazine.com/article.aspx?quickid=0703062&page=2
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andremaraAuthor Commented:
Hi Niraj,
I think the article is calling .net from fox, where I am starting off in a webservice and would like to call an executable - in this case - foxpro, but possibly other exe's as well. when i run this, "File Not Found" is the error.  Are you saying this could be a rights issue and not a 'file not found' issue?
Thanks
Andre
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