public bool LuuCuDan(CuDanModel cdm)
 {
     try
     {
         DB_QuanLyChungCuDataContext context = new DB_QuanLyChungCuDataContext();
         CuDan cd = new CuDan {
             MaCuDan = cdm.MaCuDan, TenCuDan = cdm.TenCuDan, GioiTinh = cdm.GioiTinh, NgaySinh = cdm.NgaySinh, SoDT = cdm.SoDT, SoCMT = cdm.SoCMT, QueQuan = cdm.QueQuan
         };
         context.CuDans.InsertOnSubmit(cd);
         context.SubmitChanges();
         return(true);
     }
     catch { }
     return(false);
 }
 public bool SuaCuDan(CuDanModel cdm)
 {
     try
     {
         DB_QuanLyChungCuDataContext context = new DB_QuanLyChungCuDataContext();
         CuDan cd = context.CuDans.FirstOrDefault(x => x.MaCuDan == cdm.MaCuDan);
         if (cd != null)
         {
             cd.TenCuDan = cdm.TenCuDan;
             cd.GioiTinh = cdm.GioiTinh;
             cd.NgaySinh = cdm.NgaySinh;
             cd.SoDT     = cdm.SoDT;
             cd.SoCMT    = cdm.SoCMT;
             cd.QueQuan  = cdm.QueQuan;
             context.SubmitChanges();
             return(true);
         }
     }
     catch { }
     return(false);
 }