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Reading and writing a text file with a StreamReader (C#)

<%@ Page Language="C#" %> <%@ Import Namespace="System.IO" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">     protected void Page_Load(object sender, EventArgs e)     {         StreamWriter streamwriter =              new StreamWriter(File.Open(@"Data.txt", FileMode.Open));         streamwriter.Write("This is a string");         streamwriter.Close();         StreamReader reader =                      new StreamReader(File.Open(@"Data.txt", FileMode.Open));         string tmp = reader.ReadToEnd();         reader.Close();     } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">     <title>Untitled Page</title> </head> <body>     <form id="form1" runat="server">     <div>          </div>     </form> </body> </html>