SCOM: how to give permissions using my permission level

Hello,

in a list item, I can do :

var reader = web.RoleDefinitions.GetByType(RoleType.Reader); (1)
            var grp = web.SiteGroups.GetByName(" DNY - All Staff ");
            RoleAssignment roleAssignment = new RoleAssignment();
            roleAssignment.RoleDefinitionBindings.Add(reader);
            item.RoleAssignments.Add

But I need to use my permission level in (1). Is this possible?

Thank you

Christos