Populate the list if there's not match

Hi,

my syntax is wrong

I need your help please

  public List<MissedCommitID> MissedCommitIDList(CABRManagement model)
        {
            List<MissedCommitID> MissedCommitIDList = new List<MissedCommitID>();

       
          // Here I want to check if MigrationCommitID  matches CommitID then populate the list MissedCommitIDList 


          // MigrationCommitID and CommitID fields are stored in the model.RuleDetailList
 

          //if both fields do not have the same data then populate the new list. "MissedCommitIDList "



 var MissedCommitID = _unitOfWorkCABusinessRules.RuleDetailRepo.Where(x => x.RuleDetailId == model.RuleDetailList.Where(m => m.RuleDetailID == x.RuleDetailId));

 MissedCommitIDList = MissedCommitIDList.ToList().Select(x => new MissedCommitID
            {
                CQticket = model.RuleDetailList.Select(x => x.CQTicket);
                UserName =
                Version =
                Environment =
                commitID =

               }).ToList();

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   public List<RuleDetailMgm> RuleDetailList { get; set; }

        public class RuleDetailMgm
        {
            public int RuleDetailID { get; set; }
            public string CQTicket { get; set; }
            public string Environments { get; set; }
            public string Versions { get; set; }
            public string RuleSet { get; set; }
            public string RuleIdentifier { get; set; }
            public string CommitID { get; set; }
            public string MigrationCommitID { get; set; }
            public string SubmitterLastNameFirstName { get; set; }
            public DateTime MigrationDate { get; set; }
            public DateTime CreatedDate { get; set; }
            public int CountOfAttachedDocuments { get; set; }
            
        }


RuleDetailRepo table fields

RuleDetailId	int	Unchecked
isActive	bit	Checked
RuleSetId	int	Unchecked
RuleIdentifierId	int	Unchecked
Version	varchar(50)	Unchecked
Environment	varchar(50)	Unchecked
CQTicket	varchar(250)	Unchecked
CommitID	varchar(1000)	Checked
MigrationCommitID	varchar(1000)	Checked



 public List<MissedCommitID> MissedCommitIDList { get; set; }

        public class MissedCommitID
        {
            public string CQticket { get; set; }
            public string UserName { get; set; }
            public string Version { get; set; }
            public string Environment { get; set; }
            public string commitID { get; set;  }
            public string MigrationCommitID { get; set; }
        }

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