How to trap an error from a shelled process in c#

ive been using this site for a while and have my first question to ask - as the help here is awesome.

Im writing a c# dll (for use in VbScript) and in that DLDL im shelling out a command and wish to trap the return code of that command. So far I have the following c# code:-

      public int InstallHotfix(String strAppName,string strExe,string strParam)
            {
            ProcessStartInfo startInfo = new ProcessStartInfo(strExe,strParam);                                         
            startInfo.WindowStyle = ProcessWindowStyle.Hidden;                                                          
            Process.Start(startInfo);                                                                                                  
            }

I am calling this from a VB script but would like to know how to return the result back to VBS. I assume there a 'return' value that I have to enter but im unsure how to ach开发者_C百科ieve this.

Cheers.

        ProcessStartInfo startInfo = new ProcessStartInfo(strExe, strParam);
        startInfo.WindowStyle = ProcessWindowStyle.Hidden;
        Process proc = Process.Start(startInfo);
        proc.WaitForExit();
        int exitCode = proc.ExitCode;