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Reading and writing a text file with a StreamReader (VB)

<%@ Page Language="VB" %> <%@ 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 Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)         Dim streamwriter As New StreamWriter(File.Open("Data.txt", FileMode.Open))         streamwriter.Write("This is a string")         streamwriter.Close()         Dim reader As New StreamReader(File.Open("Data.txt", FileMode.Open))         Dim tmp As String = reader.ReadToEnd()         reader.Close()     End Sub </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>