what is the best iteration alogarith to get the highest repeated Item in list ?

void AnalaysisFunc(List<CameraResult> camResult,bool IsFront)
        {
             CameraResult finalResult = new CameraResult();
                    for (int i = 0; i < camResult.Count; i++)
                    {
                        string[] key = { camResult[i].CarNoAr, camResult[i].CarNoEn, camResult[i].CitryCodeAr, camResult[i].CityCodeEn, camResult[i].CountryCode };
                        int[] repeatation = { 0, 0, 0, 0, 0 };
                        foreach (CameraResult cam in camResult)
                        {
                            if (cam.CarNoAr == key[0])
                            {
                                repeatation[0]++;
                            }
                            if (cam.CarNoEn == key[1])
                            {
                                repeatation[1]++;
                            }
                            if (cam.CitryCodeAr == key[2])
                            {
                                repeatation[2]++;
                            }
                            if (cam.CityCodeEn == key[3])
                            {
                                repeatation[3]++;
                            }
                            if (cam.CountryCode == key[4])
                            {
                                repeatation[4]++;
                            }
                        }
                        if (repeatation[0] >= camResult.Count / 2)
                        {
                            finalResult.CarNoAr = key[0];
                        }
                        if (repeatation[1] >= camResult.Count / 2)
                        {
                            finalResult.CarNoEn = key[1];
                        }
                        if (repeatation[2] >= camResult.Count / 2)
                        {
                            finalResult.CitryCodeAr = key[2];
                        }
                        if (repeatation[3] >= camResult.Count / 2)
                        {
                            finalResult.CityCodeEn = key[3];
                        }
                        if (repeatation[4] >= camResult.Count / 2)
                        {
                            finalResult.CountryCode = key[4];
                        }
                    }
                    //in case of cann't find repeatation take the last read in the list
                    if (camResult.Count > 0)
                    {
                        if (string.IsNullOrEmpty(finalResult.CarNoAr))
                        {
                            finalResult.CarNoAr = camResult[camResult.Count - 1].CarNoAr;
                        }
                        if (string.IsNullOrEmpty(finalResult.CarNoEn))
                        {
                            finalResult.CarNoEn = camResult[camResult.Count - 1].CarNoEn;
                        }
                        if (string.IsNullOrEmpty(finalResult.CityCodeEn))
                        {
                            finalResult.CityCodeEn = camResult[camResult.Count - 1].CityCodeEn;
                        }
                        if (string.IsNullOrEmpty(finalResult.CitryCodeAr))
                        {
                            finalResult.CitryCodeAr = camResult[camResult.Count - 1].CitryCodeAr;
                        }
                        if (string.IsNullOrEmpty(finalResult.CountryCode))
                        {
                            finalResult.CountryCode = camResult[camResult.Count - 1].CountryCode;
                        }

                        if (IsFront)
                        {
                            this.ForntCamThread = finalResult;
                            startAnalysisFront = false;
                            camResultFront.Clear();
                        }
                        else
                        {
                            this.BackCamThread = finalResult;
                            startAnalysisback = false;
                            camResultBack.Clear();
                        }


            }
        }



 public class CameraResult
    {

        public CameraResult()
        { }
        public CameraResult(string CountryCode, string CityCodeAr, string CityCodeEn,string carnoAr,string carNoEn)
        {
            this.CountryCode = CountryCode;
            this.CityCodeEn = CityCodeEn;
            this.CitryCodeAr = CityCodeAr;
            this.CarNoAr = carnoAr;
            this.CarNoEn = carNoEn;
        }


        string countryCode;

        public string CountryCode
        {
            get { return countryCode; }
            set { countryCode = value; }
        }

        string citryCodeAr;

        public string CitryCodeAr
        {
            get { return citryCodeAr; }
            set { citryCodeAr = value; }
        }

        string cityCodeEn;

        public string CityCodeEn
        {
            get { return cityCodeEn; }
            set { cityCodeEn = value; }
        }

        string carNoAr;

        public string CarNoAr
        {
            get { return carNoAr; }
            set { carNoAr = value; }
        }

        string carNoEn;

        public string CarNoEn
        {
            get { return carNoEn; }
            set { carNoEn = value; }
        }
    }


Is that a good way to achieve this goal with less iteration to get more performance in my case if I have list items 10 I My iteration no will be 100