Как исправить ошибку "не удается неявно преобразовать тип 'int' в 'string'" в ' qual.employee_id = recruitment.employee_id; '? мой код выглядит следующим образом

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 public class QualificationService
    {
        public void SaveQualificationDetails(RecruitmentViewModel recruitment)
        {
            Qualification qual = new Qualification();
            qual.Employee_Id = recruitment.Employee_Id;
            qual.University = recruitment.University;
            qual.Highest_Qualification = recruitment.Highest_Qualification;
            qual.Specialization = recruitment.Specialization;
            qual.GradeResult = recruitment.GradeResult;
            qual.CV = recruitment.CV;
            qual.Application_Later = recruitment.Application_Later;
            qual.Recomendation_Later = recruitment.Recomendation_Later;

            using (HRMSEntities qualContext = new HRMSEntities())
            {
                qualContext.Qualification.Add(qual);
                qualContext.SaveChanges();
            }
        }
    }
}

Что я уже пробовал:

я новичок в этом деле asp.net mvc5. но меня пробовали больше в зависимости от этого образца

[HttpPost]
        public ActionResult Login(LoginModel model, string returnUrl = "")
        {
            if (ModelState.IsValid)
            {
                int modelID = int.Parse(model.EMP_ID);
                var user = db.EMPLOYEEs.Where(u => u.EMP_ID == modelID && u.EMP_PASSWORD == model.EMP_PASSWORD).FirstOrDefault();
                    if ( user !=null)
                {
                    var roles = db.EMPLOYEEs.Select(m => m.RoleROLE_ID).ToArray();

                    CustomPrincipalSerializeModel serializeModel = new CustomPrincipalSerializeModel();
                    serializeModel.UserId = user.EMP_ID;
                    serializeModel.FirstName = user.EMP_FIRST_NAME;
                    serializeModel.LastName = user.EMP_LAST_NAME;
                    serializeModel.roles = user.RoleROLE_ID;

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