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

        private void button1_Click(object sender, EventArgs e)
        {
            double cm = 0;
            try {
                cm = Convert.ToDouble(textBox1.Text);
                textBox2.Text = Convert.ToString(cm);

            } catch (FormatException f) {

                textBox2.Text = "BAAAAD";
            }


        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            textBox1.Text = "h" + textBox1.Text;
        }
    }
}