NumberConverterForm.cs

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

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

        private void btnGo_Click(object sender, EventArgs e)
        {
            double num = double.Parse(txtNumber.Text);
            txtResult.Text = num.ToWords();
        }
    }
}