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Powershell in C# Return Command Output
protected void Button1_Click(object sender, System.EventArgs e)
{
  String username = getUser();
  String physicalPath = "S:\WebSites\" + username + "\public_html\" + TextBox1.Text;

  // Create Powershell Runspace
  Runspace runspace = RunspaceFactory.CreateRunspace();

  runspace.Open();

  // Create pipeline and add commands
  Pipeline pipeline = runspace.CreatePipeline();
  pipeline.Commands.AddScript(
    "Import-Module WebAdministration; set-psdebug -trace 1; " +

    "New-WebApplication -Site MySite" +
    " -Name " + TextBox1.Text +
    " -PhysicalPath " + physicalPath +
    " -ApplicationPool WebSites -Verbose -force");

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

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

  // Close runspace
  runspace.Close();

  //Script results to string
  StringBuilder stringBuilder = new StringBuilder();
  foreach (PSObject obj in results)
  {
    stringBuilder.AppendLine(obj.ToString());
  }

}