I have been looking around for few days, but couldn't really figure out, how I will be able to do this.

what I am doing is removing all permissions of a given list using following code,

  using (SPSite site = new SPSite("https://abc2020.development.com/portol/../default.aspx"))
                using (SPWeb web = site.OpenWeb())
                    SPList myList = web.Lists["listname"];
                    while (myList.RoleAssignments.Count > 0)

Now I want to get all the Groups/Users who have permission to web(where this list is created) and give them all my custom level permission "ABC permission level" that I created on top level sitecollection.

Oh yes there will be a user "System Account" who I wanna give FULL Control.

I looked around on google and find this code Snippet but I got no clue how can I integrate it with my situation.

    SPRoleAssignment roleAssignment = new SPRoleAssignment("dom\\user", "user@dom", "user", "some notes");
SPRoleDefinition roleDefinition = web.RoleDefinitions.GetByType(SPRoleType.Contributor);
if (!myList.HasUniqueRoleAssignments)
    myList.BreakRoleInheritance(true); // Ensure we don't inherit permissions from parent

Cheers Ali

1 Answer 1


I don't know how you're going to select the users but one option could be to loop through the Users collection of one/all of the web.Groups

For each User (which can be an AD-group) create a SPRoleAssignment and add web.RoleDefinitions["ABC permission level"] as RoleDefintionBinding before adding the RoleAssignment to the list.

For the "System Account" use web.RoleDefinitions.GetByType("Administrator")

  • thanks, It worked, I was wondering if you can know any good tutorial/article that will gonna help me go through concept of "Role Definition" & "RoleDefinitionBinding" & "RoleAssignment" please.. May 31, 2012 at 7:31
  • 1
    I don't have a really got reference but you should start with [msdn.microsoft.com/en-us/library/…, Groups, and Authorization) May 31, 2012 at 10:40

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