C#

saveFileDialog1.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*";
//Empty the FileName text box of the dialog
saveFileDialog1.FileName = String.Empty;
//Set default extension as .txt
saveFileDialog1.DefaultExt = ".txt";

//Open the dialog and determine which button was pressed
DialogResult result = saveFileDialog1.ShowDialog();

//If the user presses the Save button
if (result == DialogResult.OK)
{
    byte[] contents;
    System.Text.Encoding ascii = Encoding.Unicode;
    contents = ascii.GetBytes(textBox2.Text);

    using (Stream fs = (Stream)saveFileDialog1.OpenFile())
    {
        fs.Write(contents, 0, contents.Length);
        fs.Close();
        MessageBox.Show("File successfully saved!");
    }

}

private void openToolStripMenuItem_Click(object sender, EventArgs e)<br />
        {<br />
            OpenFileDialog openFileDialog1 = new OpenFileDialog();<br />
            openFileDialog1.Title = "";<br />
            openFileDialog1.InitialDirectory = "c:\\";<br />
            openFileDialog1.FileName = null;<br />
            openFileDialog1.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*";<br />
            openFileDialog1.FilterIndex = 1;<br />
            openFileDialog1.RestoreDirectory = true;<br />
            DialogResult result1 = openFileDialog1.ShowDialog();<br />
            string file1 = openFileDialog1.FileName;<br />
            if (result1 == DialogResult.OK)<br />
            {<br />
                Encoding enc = Encoding.GetEncoding("Windows-1251 && Windows-1250");<br />
                string s = File.ReadAllText(file1, enc);<br />
                textBox1.Text = s;<br />
            }<br />
<br />
        }