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I'm trying to add a user in a group during my event itemupdated.

Like this he has the necessary permission to move a file and after I remove him from group.

I've tried this to add but nothing appears in the group and the code runs correctly in debug:

//manage permission to delete 
SPUser user = Web.CurrentUser;
SPGroup groupAdmin = Web.Groups["Admin test"];
bool permToRemove = false;
if (user != null && groupAdmin != null)
    if (!Web.IsCurrentUserMemberOfGroup(groupAdmin.ID))
        permToRemove = true;

I'm in a sandbox solution.

share|improve this question
Is this an event receiver? Is web the root web of the site collection? Also any reason why user.Update() us being used when you are not updating its properties? – Sudhakar Jul 7 '14 at 10:27
Can you confirm that Web.CurrentUser is not a system account or null? Since your code is executed inside of ItemUpdated not ItemUpdating, HttpContext is currently null and user may be unknown at this point. – Marek Kembrowski Jul 7 '14 at 10:40
i'm at the root of the site inside event receiver itemupdated. It's not a system account and nothing is null because it goes in my if condition. Are there an other way to update user? i tryied too update group without success – user1898765 Jul 7 '14 at 12:52

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