classic asp log

Make sure you give write permissions to C:\QA Logs\ for your web user or you will get a permissions error.  The code below assumes you already have a file named, C:\QA Logs\log.txt and is modified from  http://www.4guysfromrolla.com/webtech/faq/FileSystemObject/faq3.shtml

<%
' Append a log file to C:\QA Logs\log.txt 
' "Quote is created on 01/01/2017 12:23"
' http://www.4guysfromrolla.com/webtech/faq/FileSystemObject/faq3.shtml

Const fsoForAppend = 8

Dim objFSO
Set objFSO = Server.CreateObject("Scripting.FileSystemObject")

'Open the text file
Dim objTextStream
Set objTextStream = objFSO.OpenTextFile("C:\QA Logs\log.txt", fsoForAppend)

'Display the contents of the text file
objTextStream.WriteLine "Quote is created on "&now


'Close the file and clean up
objTextStream.Close
Set objTextStream = Nothing
Set objFSO = Nothing

%>

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I suggest making this an include file and that way you can insert the include file anywhere you need it and if you ever need to make a change, you change only one file.

You can add it to a page where you accept the form data directly or if you are  using ajax, include it in your ajax page.