CmsData.OrganizationMember.MakeLeaderOfGroup C# (CSharp) Method

        public void MakeLeaderOfGroup(CMSDataContext Db, int sgId)
        {
            var omt = Db.OrgMemMemTags.SingleOrDefault(t =>
                                                      t.PeopleId == PeopleId
                                                      && t.MemberTagId == sgId
                                                      && t.OrgId == OrganizationId);
            if (omt == null)
            {
                Db.OrgMemMemTags.InsertOnSubmit(new OrgMemMemTag
                {
                    PeopleId = PeopleId,
                    OrgId = OrganizationId,
                    MemberTagId = sgId,
                    IsLeader = true
                });

            }
            else
            {
                omt.IsLeader = true;
            }
        }