📄 exercise2.aspx
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<%@ Page Language="VB" %>
<%@ Import namespace="System.IO" %>
<script runat="server">
sub Page_Load(obj as object, e as eventargs)
if not Page.IsPostBack then
tbContents.Visible = false
end if
end sub
sub DisplayFile(obj as object, e as eventargs)
dim strFile as string = tbFile.Text
dim objReader as StreamReader
if strFile <> "" then
if File.Exists(strFile) then
if not tbContents.Visible then
tbContents.Visible = true
else
tbContents.Text = ""
end if
objReader = new StreamReader(strFile)
tbContents.Text = Server.HTMLEncode _
(objReader.ReadToEnd)
objReader.Close
else
tbContents.Text = "Invalid file"
end if
end if
end sub
sub WriteFile(obj as object, e as eventargs)
dim strContents as string = tbContents.Text
dim strFile as string = tbFile.Text
dim objWriter as StreamWriter
if File.Exists(strFIle) then
objWriter = new StreamWriter(strFile, false)
objWriter.Write(strContents)
objWriter.Close
end if
end sub
</script>
<html><body>
<form runat="server">
<asp:TextBox id="tbFile" runat="server"
OnTextChanged="DisplayFile"
AutoPostBack=true /><p>
<asp:TextBox id="tbContents" runat="server"
visible=true
TextMode="Multiline"
Columns="50"
rows="20" /><p>
<asp:Button id="btSubmit" runat="server"
OnClick="WriteFile"
Text="Submit"/>
</form>
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