exe does not complete under IIS

I have the code below which sets arguments for an executable (exe) and
run it in a web page. the code works fine if in debug mode and I can
run the executable through command prompt but under IIS control it
appears that it does not execute and I can not find any errors. it has
got to be something about permissions but I have execute permissions
set to scripts and executables set. I have assigned full permissions
to ASPNEt, Network Service and host of other accounts without any
luck. The process returns a value of "0" after completion but it
really does not do what it is supposed to do. Does anybody have any
suggestions about what could be wrong?

Process process = new Process();
process.StartInfo.FileName = MyExecutable;

process.StartInfo.WorkingDirectory = new
FileInfo(MyExecutable).DirectoryName;
process.StartInfo.CreateNoWindow = true;

process.StartInfo.Arguments = arguments;

process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardError = true;



process.Start();

Trace.Warn("Process Started");


try

{

if (!process.WaitForExit(waitForExitMilliseconds))
{

ShowError("The application did not complete within an appropriate time
period.");
}

else

{

string executableErrorMessage = process.StandardError.ReadToEnd();if
(executableErrorMessage.Length != 0)
{

Trace.Warn(executableErrorMessage);

ShowError("An error occurred running the executable: " +
executableErrorMessage);
}
.

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