สอบถามวิธีการใช้งาน DialogResult คู่กับ Inputbox หน่อยครับ

        private void button1_Click(object sender, EventArgs e)
        {
            String i = Interaction.InputBox("DD", "kk", "", 0, 0);
            if (i.Length < 1)
            {
                MessageBox.Show("กด Cancel");
            }
            else
            {
                MessageBox.Show("กด Ok");
            }
        }

Interaction.InputBox("DD", "kk", "");

using System;
using System.Text;
using System.Windows.Forms;
using Microsoft.VisualBasic;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            String i = Interaction.InputBox("DD", "kk", "");
            if (i.Length < 1)
            {
                MessageBox.Show("กด Cancel");
            }
            else
            {
                MessageBox.Show("กด Ok");
            }
        }
    }
}