Progrma 2 en windows (convertidor horas)

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 WindowsFormsApplication1
{
public partial class Form1 : Form
{
int horas, minutos, segundos, dias;
public Form1()
{
InitializeComponent();
horas = minutos = segundos = dias = 0;
}
private void textBox4_TextChanged(object sender, EventArgs e)
{
}
private void label3_Click(object sender, EventArgs e)
{
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
}
private void label1_Click(object sender, EventArgs e)
{
}
private void txtconvertir_Click(object sender, EventArgs e)
{
horas = int.Parse(txthoras.Text);
minutos = horas * 60;
segundos = horas * 3600;
dias = horas / 24;
Desplegar.Items.Add("valor en horas" + horas);
Desplegar.Items.Add("suequivalencia es");
Desplegar.Items.Add("minutos" + minutos);
Desplegar.Items.Add("segundos" + segundos);
Desplegar.Items.Add("dias" + dias);
//o8211334*RAMIREZ ARZATE FORTUNATO*//
}
private void txtlimpiar_Click(object sender, EventArgs e)
{
txthoras.Clear();
Desplegar.Items.Clear();
txthoras.Focus();

}
private void txtsalir_Click(object sender, EventArgs e)
{
Close();
}
private void txthoras_TextChanged(object sender, EventArgs e)
{
}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
}
}
}