hi,
here is my code, it works fine,refer to it
protected void Button1_Click(object sender, EventArgs e)
{
string fileName = Server.MapPath("mynote.txt");
StreamReader objStreamReader;
objStreamReader = File.OpenText(fileName );
string contents = objStreamReader.ReadToEnd();
TextBox1.Text = contents;
objStreamReader.Close();
}
hope it helps