Form1.cs

using System;
using System.IO;
using System.Windows.Forms;

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

        private void saveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            DialogResult dr = saveFileDialog1.ShowDialog();
            if (dr == DialogResult.OK)
            {
                StreamWriter Write = new StreamWriter(saveFileDialog1.FileName);
                Write.Close();
                Write.Write(saveFileDialog1.FileName);
                file = saveFileDialog1.FileName;
            }
        }
        private void newToolStripMenuItem_Click(object sender, EventArgs e)
        {
            richTextBox1.Clear();
        }

        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
        private string file = "";
        private void openToolStripMenuItem_Click(object sender, EventArgs e)
        {
            DialogResult dr = openFileDialog1.ShowDialog();
            openFileDialog1.Filter = "";
            if (dr == DialogResult.OK)
            {
                StreamReader read = new StreamReader(openFileDialog1.FileName);
                read.Close();
                file = openFileDialog1 .FileName;
            }
        }



    }
}