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
{
public Form1()
{
InitializeComponent();
}
private int value1 = 0;
private int value2 = 0;
private int value3 = 0;
private int value4 = 0;
private void textBox1_TextChanged(object sender, EventArgs e)
{
int i = 0;
if(int.TryParse(textBox1.Text, out i))
{
value1 = i;
DoIt();
}
else
{
textBox1.Text = value1.ToString();
}
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
int i = 0;
if (int.TryParse(textBox2.Text, out i))
{
value2 = i;
DoIt();
}
else
{
textBox2.Text = value2.ToString();
}
}
private void textBox3_TextChanged(object sender, EventArgs e)
{
int i = 0;
if (int.TryParse(textBox3.Text, out i))
{
value3 = i;
DoIt();
}
else
{
textBox3.Text = value3.ToString();
}
}
private void textBox4_TextChanged(object sender, EventArgs e)
{
int i = 0;
if (int.TryParse(textBox4.Text, out i))
{
value4 = i;
DoIt();
}
else
{
textBox4.Text = value4.ToString();
}
}
private void DoIt()
{
textBox5.Text = (value1 + value2 + value3 + value4).ToString();
}
}
}
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