using System;

using System.Windows.Forms;

using System.IO;

using System.Text;



namespace WindowsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        private void button1_Click(object sender, EventArgs e)

        {

            try

            {

                System.IO.FileStream wFile;

                byte[] byteData = null;

                byteData = Encoding.ASCII.GetBytes("FileStream Test");

                wFile = new FileStream("c:\\streamtest.txt", FileMode.Append);

                wFile.Write(byteData, 0, byteData.Length);

                wFile.Close();

            }

            catch (IOException ex)

            {

                MessageBox.Show(ex.ToString());

           }

        }

    }

}