form, C# - rextester

form

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace tinhtiendien
{
    public partial class TinhTienDien : Form
    {
        public TinhTienDien()
        {
            InitializeComponent();
        }

private void btnThem_Click(object sender, EventArgs e)
        {
            string hoten = txtHoten.Text;
            string diachi = txtDiachi.Text;
            string macongto = txtMacongto.Text;

if (hoten.Equals("") || txtSdt.Text.Equals("") || diachi.Equals("") || txtChisotieuthu.Text.Equals("") || macongto.Equals(""))
            {
                MessageBox.Show("Khong duoc de trong");
            }
            else
            {
                DateTime ngaylapdat = Convert.ToDateTime(txtNgaylapdat.Text);
                int chisotieuthu = Convert.ToInt32(txtChisotieuthu.Text);
                DateTime ngaysinh = Convert.ToDateTime(txtNgaysinh.Text);
                int sdt = Convert.ToInt32(txtSdt.Text);

Congtodien ctd = new Congtodien(hoten, ngaysinh, sdt, diachi, macongto, chisotieuthu, ngaylapdat);
                listbox.Items.Add(ctd.ToString());
            }
        }
    }
}


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