The requirement is that you need to set an ExitCode in your PowerShell script and act appropriately in C# code. Sounds quite simple initially, but it is a little bit tricky. Here is how to achieve this.

Part 1: Modify your PowerShell code

 try
{
    Your PowerShell Code here





    $host.SetShouldExit(100)  #Set the Exitcode here. I am setting it to 100
}
catch [System.Exception]
{
    AddToLog("$_")  #Add to log or whatever you feel like
} 

Part 2: Read the exit code in C#

ProcessStartInfo psi = new ProcessStartInfo();
psi.FileName = "powershell";
psi.WorkingDirectory = Environment.CurrentDirectory + "\\Scripts";
psi.Arguments = Environment.CurrentDirectory + "\\Scripts\\ScriptFile.ps1";
psi.WindowStyle = ProcessWindowStyle.Maximized;
Process p = Process.Start(psi);
p.WaitForExit();
if (p.ExitCode == 100)
{
     // Do something for Success
}
else
{
     // Do something for failure
}

Hope this helps,
Rahul

Quote of the day:
"Three may keep a secret, if two of them are dead." - Benjamin Franklin