c# - Executing PowerShell Script with Parameters -

sup. i'm adapting this solution windows forms solution. far i've been able execute get-wulist command no problems. doesn't seem go hide-wuupdate. i've tried far:

public class powershellcontroller : ipowershell {      //created @ global scope can fetch it.     initialsessionstate initial;     runspaceinvoke scriptinvoker;     runspace runspace;     powershell ps;      //the view control     iview view;      //the helper gridviewprocessor class     igridviewprocessor gp;      //initializing controller - loads module.     public powershellcontroller()     {         initial = initialsessionstate.createdefault();         initial.importpsmodule(new string[] { @"c:\users\jose\documents\windowspowershell\modules\pswindowsupdate\pswindowsupdate.psd1" });         scriptinvoker = new runspaceinvoke();         scriptinvoker.invoke("set-executionpolicy unrestricted -scope process");          runspace = runspacefactory.createrunspace(initial);         runspace.open();          using (ps = powershell.create())         {             ps.runspace = runspace;         }          //console.writeline("please wait. take while load.");      }       public void setview(iview view, igridviewprocessor gp)     {         this.view = view;         this.gp = gp;     }       public void getavailableupdates()     {          messagebox.show("ok. program kind of hang. normal." +                         "this means start looking updates "             );          ienumerable<psobject> wulist; //placeholder ps executed command          using (ps = powershell.create())         {             //adds powershell command             ps.commands.addcommand("get-wulist");             //executes powershell command             wulist = ps.invoke();         }          //loads model - can later on rewritten ninject support.         list<windowsupdate> model = new list<windowsupdate>();         int id = 1;         foreach (psobject result in wulist)         {             windowsupdate item = new windowsupdate             {                 id = id,                 name = result.members["title"].value.tostring(),                 size = result.members["size"].value.tostring(),                 type = updatetype.undefined,              };             model.add(item);             id++; //icnrease id count             //console.writeline("update name {0} --- size: {1}", result.members["title"].value.tostring(), result.members["size"].value.tostring());         }          //adds view:         view.addupdatetogrid(model);     }      public void hideselectedupdates(datagridview grid)     {         //gets selectedupdates windowsupdate model         var selectedupdates = gp.getselectedupdates(grid);         using (ps = powershell.create())         {             foreach (var update in selectedupdates)             {                 ps.commands.clear();                 ps.commands.addcommand("hide-wuupdate").addparameter("title",update.name).addparameter("confirm", false);                  //ps.commands.addcommand("hide-wuupdate -title \""+update.name+"\"");                var result = ps.invoke();              }          }          messagebox.show("updates have been hidden");      }  } 

the method can't seem work hideselectedupdates(datagridview grid).

script gets executed , no exceptions thrown, doesn't seem reflect changes @ all.

any suggestions?