How do I get the "ERRORLEVEL" variable set by a command line scanner in my C# program?

In my website I want to virus-check any uploaded files before saving them into my database. So I save the file to the local directory then kick-off a command-line scanner process from inside my C# program. Here is the code I use: ``` string pathToScannerProgram = Path.Combine(virusCheckFolder, "scan.exe"); ProcessStartInfo startInfo = new ProcessStartInfo(); startInfo.FileName = pathToScannerProgram; startInfo.Arguments = String.Format("\"{0}\" /FAM /DAM", fileToScanPath); startInfo.RedirectStandardOutput = true; startInfo.WindowStyle = ProcessWindowStyle.Hidden; startInfo.UseShellExecute = false; using (Process process = new Process()) { process.StartInfo = startInfo; process.Start(); string output = process.StandardOutput.ReadToEnd(); string errorLevel = Environment.GetEnvironmentVariable("ERRORLEVEL"); process.WaitForExit(); } ``` My problem is that Environment.GetEnvironmentVariable("ERRORLEVEL") is always returning null. It should be returning a number. So how do I get the "ERRORLEVEL" set by the command line scanner in my C# program?