using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace allpractise
{
    public partial class Form1 : Form
    {
          //To hold True or Flase
        private bool allowClose = false;

        public Form1()
        {
            InitializeComponent();
        }

     
             //Button Close Event
        private void btnClose_Click(object sender, EventArgs e)
        {
            allowClose = true;
            this.Close();
        }
           //Form Closing Event
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (!allowClose) { e.Cancel = true; }
        }
    }
}