SharePoint how to hide Webpart using power shell script

$SPsite = Get-SPSite http:<MY-SHAREPOINT-SITE>/sites/admin/
$SPweb =  $SPsite.OpenWeb() 

# get the webpart manager for the page
$webpartmanager = $SPweb.GetLimitedWebPartManager(($SPweb.Url + "default.aspx"),  [System.Web.UI.WebControls.WebParts.PersonalizationScope]::Shared)   


For($i=0;$i -lt $webpartmanager.WebParts.Count;$i++)  
 {  
#Check for particular web part
if($webpartmanager.WebParts[$i].title -eq "Task")
  {  
       $webpartmanager.WebParts[$i].Hidden=true;
       break;

  }
} 

$SPweb.Update();

$SPweb.Dispose();