public static bool Add(FingerScan fin)
        {
            var oldfin = new FingerScan();

            try
            {
                if (fin != null)
                {
                    oldfin = GetObjByEmployeeID(fin.EMP_ID);

                    DeleteByEmployeeID(fin.EMP_ID);

                    using (var ctx = new BIG_DBEntities())
                    {
                        ctx.FingerScans.Add(fin);
                        ctx.SaveChanges();
                    }
                }

                return(true);
            }
            catch (Exception ex)
            {
                Add(oldfin);
                throw ex;
            }
        }
        public static FingerScan GetObjByEmployeeID(string emp)
        {
            var result = new FingerScan();

            try
            {
                using (var ctx = new BIG_DBEntities())
                {
                    result = ctx.FingerScans.Where(x => x.EMP_ID == emp).FirstOrDefault();
                }
                return(result);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }