ps.Commands.AddCommand("Get-Command");

InitialSessionState initial = InitialSessionState.CreateDefault();
initial.ImportPSModule(new string[] {@"C:Program FilesMicrosoft Application VirtualizationClientAppvClientAppvClient.psd1" });

ps.Commands.AddCommand("Import-Module").AddArgument("AppvClient");

public static void powershellCommand()
        {
            Collection<PSObject> result;

            using (Runspace myRunSpace = RunspaceFactory.CreateRunspace())
            {
                InitialSessionState initial = InitialSessionState.CreateDefault();
                initial.ImportPSModule(new string[] {@"C:Program FilesMicrosoft Application VirtualizationClientAppvClientAppvClient.psd1" });
                Runspace runspace = RunspaceFactory.CreateRunspace(initial);
                runspace.Open();
                PowerShell ps = PowerShell.Create();
                ps.Runspace = runspace;
                ps.Commands.AddCommand("Import-Module").AddArgument("AppvClient");

                ps.Commands.AddCommand("Get-AppvVirtualProcess");

                result = ps.Invoke();
                    var builder = new StringBuilder();
                    foreach (PSObject psObject in result)
                    {

                        builder.Append(psObject.ToString() + "n");
                        builder.ToString();

                    }

                    Console.WriteLine("Virtual Process: {0}", builder.ToString());
                }

        }

public static void p()
        {

            using (var powershell = PowerShell.Create())
            {
                powershell.AddCommand("Get-AppvVirtualProcess");

                powershell.Invoke();

            }
        }