CmsData.OrganizationMember.IsInGroup C# (CSharp) Method

        public bool IsInGroup(string name)
        {
            var mt = Organization.MemberTags.SingleOrDefault(t => t.Name == name);
            if (mt == null)
                return false;
            var omt = OrgMemMemTags.SingleOrDefault(t => t.MemberTagId == mt.Id);
            return omt != null;
        }

 private static OrganizationMember AddSender(OrganizationMember om)
 {
     if (!om.IsInGroup("Goer"))
         om.MemberTypeId = MemberTypeCode.InActive;
     om.AddToGroup(DbUtil.Db, "Sender");
     return om;
 }