Usesystem

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 Exámen_Final

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void textBox1_TextChanged(object sender, EventArgs e)

{

Limpiar.Enabled = true;

}

private void textBox9_TextChanged(object sender, EventArgs e)

{

}

private void button1_Click(object sender, EventArgs e)

{

articulolb.Items.Add(articulos1.SelectedItem.ToString());

cantlb.Items.Add(cant1.Value);

unidadlb.Items.Add(precio.SelectedItem);

decimal importe;

importe = Convert.ToDecimal(precio.SelectedItem);

importelb.Items.Add(cant1.Value * importe);

articulos1.Text = "";

precio.Text = "";

cant1.Value = 1;

agregar.Enabled = false;

}

private void button5_Click(object sender, EventArgs e)

{

Close();

}

private void articulos1_SelectedIndexChanged(object sender, EventArgs e)

{

Limpiar.Enabled = true; int indice;

indice = articulos1.SelectedIndex;

precio.SelectedIndex = indice;

agregar.Enabled = true;

}

private void Form1_Load(object sender, EventArgs e)

{

agregar.Enabled = false;

quitar.Enabled = false;

Limpiar.Enabled = false;

}

private void precio_SelectedIndexChanged(object sender, EventArgs e)

{

int indice;

indice = articulos1.SelectedIndex;

precio.SelectedIndex = indice;

}

private void quitar_Click(object sender, EventArgs e)

{

int indice;

indice = articulolb.SelectedIndex;

if (indice >= 0)

{

articulolb.Items.RemoveAt(indice);

cantlb.Items.RemoveAt(indice);

unidadlb.Items.RemoveAt(indice);

importelb.Items.RemoveAt(indice);

}

else

{ }

quitar.Enabled = false;

}

private void cantlb_SelectedIndexChanged(object sender, EventArgs e)

{

}

private void articulolb_SelectedIndexChanged(object sender, EventArgs e)

{

quitar.Enabled = true;

}

private void calcular_Click(object sender, EventArgs e)

{

int i;

double sub = 0;

for (i = 0; i < importelb.Items.Count; i++)

{

sub += Convert.ToDouble(importelb.Items[i]);

}

if (sub != 0)

{

textBox6.Text = string.Format("S/.{0:F2}", sub);

double a;

a = sub + (sub * 0.18);

textBox9.Text = sub.ToString();

}

else

{

textBox6.Text = "";

MessageBox.Show("Seleccione al menos un producto");

}

}

private void Limpiar_Click(object sender, EventArgs e)

{

textBox1.Text = "";

textBox2.Text = "";

textBox3.Text = "";

textBox4.Text = "";

textBox5.Text = "";

textBox6.Text = "";

textBox8.Text = "";

textBox9.Text = "";

contado.Checked = true;

cant1.Value = 1;

articulos1.Text = "";

precio.Text = "";

numlb.Items.Clear();

cantlb.Items.Clear();

articulolb.Items.Clear();

unidadlb.Items.Clear();

importelb.Items.Clear();

Limpiar.Enabled = false;

}

private void print_Click(object sender, EventArgs e)

{

}

private void textBox2_TextChanged(object sender, EventArgs e)

{

Limpiar.Enabled = true;

}

private void textBox3_TextChanged(object sender, EventArgs e)

{

Limpiar.Enabled = true;

}

private void textBox4_TextChanged(object sender, EventArgs e)

{

Limpiar.Enabled = true;

}

private void textBox5_TextChanged(object sender, EventArgs e)

{

Limpiar.Enabled = true;

}

private void credito_CheckedChanged(object sender, EventArgs e)

{

articulos1.Text = "";

precio.Text = "";

cant1.Value = 1;

Limpiar.Enabled = true;

precio.Items.Clear();

precio.Items.Add(400 + (400 * 0.15));

precio.Items.Add(15 + (15 * 0.15));

precio.Items.Add(2500 + (2500 * 0.15));

precio.Items.Add(2800 + (2800 * 0.15));

precio.Items.Add(2700 + (2700 * 0.15));

precio.Items.Add(600 + (600 * 0.15));

precio.Items.Add(90 + (90 * 0.15));

precio.Items.Add(120 + (120 * 0.15));

}

...