Добавление пользователя в разрешения списка

           SPSite site = new SPSite("http://localhost/site");

           SPWeb web = site.OpenWeb();

           SPList list = web.Lists["nameList"];

           list.BreakRoleInheritance(false);

           SPUser user = new SPFieldUserValue(web, properties.ListItem["AssignedTo"].ToString()).User;

           SPRoleDefinition role = web.RoleDefinitions["nameRole"];

           SPPrincipal PrincipalEmployees = user;

           SPRoleAssignment RoleAssignmentEmp = new SPRoleAssignment(PrincipalEmployees);

           RoleAssignmentEmp.RoleDefinitionBindings.Add(role);

           list.RoleAssignments.Add(RoleAssignmentEmp);

     list.Update();