C# Program to Perform Subtraction with Key Up Event

Code:

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 WindowsFormsApplication14
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_KeyUp(object sender, KeyEventArgs e)
        {
            int sub;
            sub = Convert.ToInt32(textBox1.Text) - Convert.ToInt32(textBox2.Text);
            textBox3.Text = Convert.ToString(sub);
            MessageBox.Show("Subtraction is performed with KeyUp Event");

        }
    }
}


Output:




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