using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace NoteBook1
{
    public partial class Form1 : Form
    {
        private bool isFilePass = true;

        public Form1()
        {
            InitializeComponent();
        }

        private void newToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (isFilePass)
                richTextBox1.Text = string.Empty;
            else
                Close();
        }
        protected override void OnClosing(CancelEventArgs e)
        {
            SaveFileDialog saveAs = new SaveFileDialog();
            DialogResult dialogResult = MessageBox.Show("Do you want to save changes to file?", "My noteBook", MessageBoxButtons.YesNoCancel);
            if (DialogResult.Yes == dialogResult)
            {
                saveAs.ShowDialog();
            }
            else if (DialogResult.No == dialogResult)
            {
                Close();
            }
            else
                e.Cancel = true;
        }
    }
}