public static int UpdateKhachHang(string _MaKH, string _TenKH, string _Sdt, string _DiaChi)
 {
     try
     {
         Model.KhachHangMod kh = new Model.KhachHangMod(_MaKH, _TenKH, _Sdt, _DiaChi);
         return(kh.UpdateKhachHang());
     }
     catch
     {
         return(0);
     }
 }
 public static int DeleteKhachHang(string _MaKH)
 {
     try
     {
         Model.KhachHangMod kh = new Model.KhachHangMod(_MaKH);
         return(kh.DeleteKhachHang());
     }
     catch
     {
         return(0);
     }
 }
 public static DataSet FillDataSet_SearchKhachHangbyTenKH(string _TenKH)
 {
     try
     {
         Model.KhachHangMod kh = new Model.KhachHangMod(_TenKH);
         return(kh.FillDataSet_SearchKhachHangbyTenKH());
     }
     catch
     {
         return(null);
     }
 }