Trying w/o success to execute a PowerShell script from C#

I am trying to execute a PowerShell script to enable mailboxes on a Exchange 2010. The actual email account creation application is a Java servlet running on a Tomcat server ancd the servlet does most of the work validating the request and populating various system with the account info, including ActiveDirectory. Cutting to the chase, I wrote a service that listens for requests (generated by the servlet) that contains two lines of data, the user name and the database. The error message returned is:

Cannot validate argument on parameter 'Session'. The argument is null. Supply a non-null argument and try the command again.


This is the code:

Code:

---

        private void run()
        {
            String inString;
            while (true)
            {
                TcpClient client = listener.AcceptTcpClient();
                NetworkStream ns = client.GetStream();

                StreamWriter writer = new StreamWriter(ns);
                StreamReader reader = new StreamReader(ns);

                Command myCommand = new Command(scriptFile);
               
                // create and open Powershell runspace
                Runspace runspace = RunspaceFactory.CreateRunspace();
                runspace.Open();
               
                // create a pipeline and feed it the script text
                Pipeline pipeline = runspace.CreatePipeline();

                try
                {
                    while (true)
                    {
                        inString = reader.ReadLine().Trim();
                        if (inString.Equals("eot",
                            StringComparison.CurrentCultureIgnoreCase))
                            break;

                        eventLog.WriteEntry(inString);

                        String[] parms = inString.Split(':');

                        CommandParameter testParam = new CommandParameter(parms[0], parms[1]);
                        myCommand.Parameters.Add(testParam);
                    }
                }
                catch (Exception e)
                {
                    eventLog.WriteEntry(e.Message);
                }

                pipeline.Commands.Add(myCommand);
                pipeline.Commands.Add("Out-String");

                // execute the script
                Collection<PSObject> results = new Collection<PSObject>();
                try
                {
                    results = pipeline.Invoke();
                }
                catch (Exception ex)
                {
                    results.Add(new PSObject((object)ex.Message));
                }

                // close the runspace
                runspace.Close();

                // convert the script result into a single string
                StringBuilder stringBuilder = new StringBuilder();

                foreach (PSObject obj in results)
                {
                    stringBuilder.AppendLine(obj.ToString());
                }

                writer.WriteLine(stringBuilder.ToString());
                writer.Flush();

                ns.Close();
                client.Close();
            }
        }

---

This is the PowerShell script that the Echange admin wrote for me:

Code:

---

param([string]$username,[string]$database)
$sess = New-PSSession -Configurationname Microsoft.Exchange -ConnectionUri http://mail.wfo.linfield.edu/powershell
Import-PSSession -session $sess
enable-Mailbox -DomainController fenrir.catnet.wfo.linfield.edu -identity $username -database $database

---

Any ideas about what wrong?


Rob Tanner
Linfield College