// Method Update
 public static int UpdateKhachHang(string _idKhachHang, string _tenKhachHang, string _dienthoai, string _email, string _diachi)
 {
     try
     {
         Models.KhachHangMod _khachHang = new Models.KhachHangMod(_idKhachHang, _tenKhachHang, _dienthoai, _email, _diachi);
         return(_khachHang.UpdateKhachHang());
     }
     catch
     {
         return(0);
     }
 }
 // Method Delete
 public static int DeleteKhachHang(string _idKhachHang)
 {
     try
     {
         Models.KhachHangMod _khachHang = new Models.KhachHangMod(_idKhachHang);
         return(_khachHang.DeleteKhachHang());
     }
     catch
     {
         return(0);
     }
 }
 public static DataSet FillDataSet_spgetKhachHangByIdKhachHang(string _idkhachhang)
 {
     try
     {
         Models.KhachHangMod khang = new Models.KhachHangMod(_idkhachhang);
         return(khang.FillDataSet_getKhachHangByIdKhachHang());
     }
     catch
     {
         return(null);
     }
 }