Run powershell in C#

[jwradhe]

Hi! I am pretty new to this, but im trying to present when the latest winupdate was done on computer, and only found in powershell to present that, and i tried to run it in C#, but no error and no result. I understand that im doing wrong, but what is the best way to do this?

// Get Latest Windows Update
private void LastWinUpd()
{

        Runspace runspace = RunspaceFactory.CreateRunspace();
        runspace.Open();

        PowerShell ps = PowerShell.Create();
        ps.Runspace = runspace;

        //ps.Commands.AddScript("gwmi win32\_quickfixengineering | Select-Object -expandProperty 'installedon' | sort installedon -desc | Select-Object -First 1 | Get-Date -Format 'yyyy - MM - dd K'");

        ps.AddCommand("$a = (New - Object - com 'Microsoft.Update.AutoUpdate').Results");
        ps.AddCommand("$a.LastInstallationSuccessDate | Get - Date - Format 'yyyy-MM-dd K'");

        Collection results = ps.Invoke();

        runspace.Close();

        StringBuilder stringBuilder = new StringBuilder();
        foreach (PSObject obj in results)
        {
            text\_LastWinUpd.Text = obj.ToString();
        }
       
    }
    // END