Hiding WebParts programatically does not work

Question

I am using the following code to hide all WebParts in a page.

string siteUrl = "http://site";
SPSite site = new SPSite(siteUrl);
SPWeb web;
web = site.RootWeb;
web.AllowUnsafeUpdates = true;
Microsoft.SharePoint.WebPartPages.SPLimitedWebPartManager mgr = null;
mgr = web.GetLimitedWebPartManager("pages/test.aspx", System.Web.UI.WebControls.WebParts.PersonalizationScope.User);
mgr.Web.AllowUnsafeUpdates = true;
foreach (System.Web.UI.WebControls.WebParts.WebPart wp in mgr.WebParts)
        {
            wp.Hidden = true;
            mgr.SaveChanges(wp);
        }
web.Dispose();
site.Dispose();

Test Page has a Content Editor WebPart, Few List View WebParts and a Custom Webparts. Code runs without any errors but does not hide the Content Editor WebPart and Custom Webpart.

I am running this code in a Sharepoint 2010 installation. Any ideas?

Note:

1. I am not able to hide them using Web Interface as well.
2. I am able to change other properties like Title using code and it works perfectly fine for all thr Web Parts.
3. This code works if the user is given Full Permission for the whole site (I am expecting it to work when the user is given contribute permission for the page alone)This code used to work in MOSS 2007 and the user was given contribute permission for this page alone.

Answer 1

Finaly got it working. Had to change Web Part Security to fix it. Thanks for the help.

Answer 2

Maybe you're looking for AllowHide property? :)

Update: I was able to hide a ContentEditorWebPart in my SharePoint 2010 environment. Maybe this may help you, here is the full list of properties of the webpart.

ContentLink                        :
Content                            : Content
PartStorage                        :
ContentHasToken                    : False
Title                              : Content Editor
FrameType                          : Default
SuppressWebPartChrome              : False
Description                        : Allows authors to enter rich text content.
IsIncluded                         : True
ZoneID                             : Left
PartOrder                          : 0
FrameState                         : Normal
Height                             :
Width                              :
AllowRemove                        : True
AllowZoneChange                    : True
AllowMinimize                      : True
AllowConnect                       : True
AllowEdit                          : True
AllowHide                          : True
IsVisible                          : True
Hidden                             : False
CatalogIconImageUrl                : /_layouts/images/mscontl.gif
TitleIconImageUrl                  :
TitleUrl                           :
DetailLink                         :
HelpUrl                            :
HelpLink                           :
HelpMode                           : Modeless
Dir                                : Default
PartImageSmall                     :
MissingAssembly                    : Cannot import this Web Part.
ImportErrorMessage                 : Cannot import this Web Part.
PartImageLarge                     : /_layouts/images/mscontl.gif
IsIncludedFilter                   :
AuthorizationFilter                :
ExportControlledProperties         : True
ConnectionID                       : 00000000-0000-0000-0000-000000000000
ID                                 : g_7762e716_abae_47f1_a4f6_fcafe0411f83
StorageKey                         : 7762e716-abae-47f1-a4f6-fcafe0411f83
Connections                        :
UnknownXmlElements                 : {}
SerializedAttachedPropertiesShared :
SerializedAttachedPropertiesUser   :
CssStyleSheet                      :
UseDefaultStyles                   : True
Qualifier                          :
ClientName                         : varPart
Caption                            :
Subtitle                           :
Permissions                        : PersonalProperties
BrowserDesignMode                  : False
EffectiveTitle                     : Content Editor
EffectiveStorage                   : Personal
EffectiveFrameType                 : Standard
AllowClose                         : True
ChromeState                        : Normal
ChromeType                         : Default
ConnectErrorMessage                :
Direction                          : NotSet
DisplayTitle                       : Content Editor
ExportMode                         : All
HasUserData                        : True
HasSharedData                      : False
IsClosed                           : False
IsShared                           : True
IsStandalone                       : False
IsStatic                           : False
Verbs                              : {}
WebBrowsableObject                 : Microsoft.SharePoint.WebPartPages.ContentE
                                     ditorWebPart
Zone                               :
ZoneIndex                          : 0
Controls                           : {}
BackImageUrl                       :
DefaultButton                      :
GroupingText                       :
HorizontalAlign                    : NotSet
ScrollBars                         : None
Wrap                               : True
AccessKey                          :
Attributes                         : System.Web.UI.AttributeCollection
BackColor                          : Color [Empty]
BorderColor                        : Color [Empty]
BorderWidth                        :
BorderStyle                        : NotSet
ControlStyle                       : System.Web.UI.WebControls.PanelStyle
ControlStyleCreated                : True
CssClass                           :
Style                              : System.Web.UI.CssStyleCollection
Enabled                            : True
EnableTheming                      : True
Font                               :
ForeColor                          : Color [Empty]
HasAttributes                      : False
SkinID                             :
TabIndex                           : 0
ToolTip                            :
ClientID                           : g_7762e716_abae_47f1_a4f6_fcafe0411f83
EnableViewState                    : True
NamingContainer                    :
BindingContainer                   :
Page                               :
TemplateControl                    :
Parent                             :
TemplateSourceDirectory            :
AppRelativeTemplateSourceDirectory :
Site                               :
Visible                            : True
UniqueID                           : g_7762e716_abae_47f1_a4f6_fcafe0411f83

And here is the PowerShell code I used (it's actually similar to yours C#, I don't see any difference, as soon PowerShell simply calls SharePoint object model):

$w = Get-SPWeb http://localhost
$wpm = $w.GetLimitedWebPartManager("default.aspx", [System.Web.UI.WebControls.WebParts.PersonalizationScope]::User);

$wpm.WebParts[3].Hidden = $true
$wpm.SaveChanges($wpm.Webparts[3]);

Answer 3

Are you running this code on a Publishing Site? Try running it on a non-publishing site.

I wonder if it's related to check-in / versioning of publishing pages.