My scenario is I am having two lists X and Y . Of which both have broken inheritance and having unique permissions. Now i am trying to add new group to the list permissions and assign read only access to that group. How to follow to do so programatically. I am using SharePoint 2010. Till now i was succesfull to create groups to the list permissions. but unable to make group as read only to the list.Thanks in advance.

1 Answer 1


You should add new role definition to the list’s role assignments collection.

Here is the code to do that:

SPList list = …//your list
SPPrincipal principal = …//user or group;

SPRoleAssignment roleAssignment = new SPRoleAssignment(principal);
SPRoleDefinition roleDefinition = new SPRoleDefinition();
roleDefinition = list.ParentWeb.RoleDefinitions.GetByType(SPRoleType.Reader);
SPRoleDefinitionBindingCollection roleDefinitionBindingCollection = new SPRoleDefinitionBindingCollection();
list.ParentWeb.AllowUnsafeUpdates = true;
list.ParentWeb.AllowUnsafeUpdates = false;

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