Changing the Modified Date of a List Item using the SharePoint Client Object Model (C#) with Contribute Permission

Question

I have a small snippet of code that I use to update the Modified Date of a list item and it works great for users with Full Control permissions.  However, for users with just Contribute access to the site the code doesn't work.  Instead, SharePoint
just updates the Modified Date to now.
I did some testing, and narrowed down the specific permission level that allows updating of Modified dates and oddly enough, it's the "Manage Permissions" level.
Has anyone run into this issue? If so, how do I work around this and update the Modified date as a user with only Contribute access to a site/library?
Here's the code:
DateTime Test = new DateTime(2012, 5, 4);
ListItem li = list.GetItemById(itemID);
li["Modified"] = Test;
li.Update();
ct.ExecuteQuery();
Thanks,
Max

Answer 1

Hello,
As a workaround you can pass admin credential in your code because as per my knowledge contributor can't update default columns like: created by, modified by, modified, created.
ClientContext clientContext = newClientContext(siteUrl);
ClientContext.Credentials = newNetworkCredential(UserName, Password, Domain);
Hope it could help
Hemendra:Yesterday is just a memory,Tomorrow we may never see
Please remember to mark the replies as answers if they help and unmark them if they provide no help